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Burst and Carry
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+10% Attack Speed
+8 Magic Resist
+8 Magic Resist
Ability Order Ability Order
Threats & Synergies
Extremely difficult to play against once annie hits 6. Her stun can stop you dead in your tracks and she can one shot you. Consider building athenes first and roaming. Care for the range of her flash plus stun. BE READY TO W OR FLASH OUT. Only fight when her stun and tibbers are down. It's easy if you get ahead, but if you're even or behind a point and click stun is a good way to stop a mobile champion.
Insanely easy. Wait for him to use his w to farm and W + R + E + Q him. If he is good he will keep his distance, but your W + R combo will be too much gap close for him. Either zone him or kill him. He doesn't win until late late game where he, once again, has a point and click stun that stops you.
Okay, I used to think this matchup was Leblanc favored, but now I think it's much more difficult. I think it's completely a skill matchup and dodging out her charm. She's insanely easy to kill if you can bait it out. Also don't use w in a straight line, it's an easy Q for Ahri. This matchup is all about faking with your w or dodging out her charm.
Good zed players will win this matchup usually. You have to be good with your chain to win this. He can ult to dissolve your W or E when you go in. Knowing his ult and working around it will help you to win. His ult is on a long cooldown and yours is not. Saving your W and your R is important to getting away when he does ult you. If he ults then you W away after he returns he will follow you with his shadow. You either have to W back or R toward your turret. Usually when zeds all in they have back up so try to save your R. Early game you can win, but you have to be fast with your W or else he will auto E, Q you if you're slow going back to your pad. Only try to trade when his W is down. It cuts his ability to out trade you by a lot. Early game wait until he uses his Q to farm, once he does that you can zone him off cs until it's back up. BUILD HOURGLASS, if you wanna get close and person it's all about dodging his Q, that is all you should be thinking about. Zed maxes this and when he hits a double shadow or triple shadow Q, it HURTS. Dodge it with your W or try to get boots early and have some tricky footwork.
Don't see this matchup a lot anymore. The key to trading with fizz is to trade when his e is down. It has a long cooldown early game and uses a lot of mana. Harassing with your Q + W early game is important and fairly easy to do since he's melee. Don't be so obvious and do your combo quickly or else even bad fizz players can E it. In this matchup fizz will be worried about your W damage early game and try to avoid it. Zone him off cs while your sigil is on him or if he still trys to cs then W him. DO NOT DO THIS ONCE HE HITS 6. Easy shark and kill for him. However, if you're smart with your W then you can react to the fish once it's thrown. Try to avoid getting in range of his Q post 6 because it's easy to shark and Q at the same time. Later in the game it is more of damaging him enough so he blows his E, but 1v1 late game fizz can easily win. Your E can slow him down late game if you can get it on him after he blows his E. However, most Fizz players will take hourglass and can stall for a very long time. You can burst easily if his E and hourglass are down, but I would avoid any 1v1s unless you're very far ahead or they're very bad. Avoiding his W AA is important. Hourglass can also help this matchup because of the update making fizz completely reliant on his ult hitting. (Skill Matchup)
I do not think this matchup is as hard as people think it is. More of a matter of dodging Qs and baited out her stun. When you W ALWAYS side step. Going back on your W is a deathwish. Better syndras can Q + E you when you W foward. Earlier hourglass or banshees isn't a horrible option. YOU ARE STILL MORE MOBILE THAN HER. Once her stun is down it should be an easy kill unless she's very fed and just presses R on you....which is sad. Easy ganks and easy roams, she's a snail.
It's a little difficult to deal with this champion purely because he out ranges you. The W + Q can be overwhelming. You can win lane still, but you have to play hyper aggressive. Constantly be in Azir's face and try to out trade him. If you play at a distance then he will just out farm you and out poke you. Azir does have a dash so he is not as easily gankable as other champions. Try to play around the map more or play very aggressive.
DO NOT LET HER ROAM. So important to max W against this champion and make her back first. You crush her early game, but all Kats love to roam. Once she gets 6 do not let her poke you down to half health with that disgusting Q, avoid her daggers and predicting her E's are huge. Katarinas love to trick people, take this into account and try to think where she will go next. Try to save your W to bait out her ult and W away. You should win most trades though. Most important thing is to establish vision and SHOVE A LOT. If you can hit your chain on her it is a lot of free poke. Good Katarinas will E your distortion. Getting that E on them and trading when she can't move will prevent her from dodging your combo. PAY ATTENTION TO WHERE THE MINION WAVE COMING IN IS, Katarinas always use minions to escape. If she gets fed there isn't a lot of counter play.
I have never had trouble against this champion. She can shove hard, but leblanc out trades her so hard. If she misses her snare she loses all pressure. Playing up is important in this matchup. If you play back she will farm and be more useful than you. Go aggressive, bait out her snare and kill her. Use Leblanc's mobility to dodge her snare or catch her while she is trying to pick up that last minion with it. If you do get snared though you lose the trade. Hard. You will probably die. No pressure.
Hard matchup at 6. Your range is pretty much her Q range and Diana is so reliant on hitting her Q. Try to trade when her Q is on cooldown. She can one shot you if she hits and she can follow you. Play safe until she blows it and then trade with her. Trading into her W is difficult early came. The chains are kind of important in this matchup, double your chain up on her and keep her away from you. You win pre 6, just make sure you don't W back into her Q because a lot of dianas throw their Q at your return pad. I don't W back until I'm sure the Q won't hit me if I do. Her Q also shows you through your passive which is problematic. Just try to avoid it. She outscales you and can 1v1 you easy post 6. Play aggresive pre 6 and roam. Ganks are also good against this champ because of her low mobility.
The issue I have with Ez and all ADs mid is that it is easier to farm. Ez can outscale you so you should play aggressive. It is hard for him to win trades if you play in your minion wave. It is also hard for ez to all in. The only way you can lose this lane is ganks, so keep good vision and kill them a lot.
Same thing with Ez except I think corki is weaker at farming. Although corki has more reliable damage against leblanc because his spells are aoe. Keeping your distance in this matchup is important. If you let him AA you before and after your combos he can win. Try to all in him instead of trading so much. AD mids are very weak at all ins. Corki in specific has a lot more pressure if he hits his Q. Although it's hard to hit and it's a better idea to walk out of it than to W out. His Q cooldown is on a shorter cooldown than your W.
Not a crazy hard matchup. Try to be quick with trades and keep away from his Q auto trades. Disgusting damage can come out of his E and if he puts his W on your return pad then you could be in trouble. However, Leblanc's mobility should be ability to overcome this.
Personally I hate this matchup. ONLY TRADE WHEN YOU ARE NOT POISONED. Which is hard because Cass has aoe and a fast posion time on her Q and W. You will lose every trade against a good Cass. Playing safe and using your early wave clear creates pressure every place else on the map. ONLY TRADE IF SHE Qs SOMETHING THAT IS NOT YOU. Also make sure you're quick on your W/R return pads. She can ult you if you aren't. Although, you will most likely still be in the slow range, you will be able to move. Roam and get ganks. Cass is immobile, but she can 2v1 if you are low so try to gank around cooldowns. If she decides to max Q then you have a lot more kill pressure on her because her output in an all in is very low. You can play aggressive if she does this. The reason this is major is because her W trashes your kit. Leblanc has to go in and if you're anywhere near that W you're just dead. It's easy to play if you're ahead.
Xerath's E and leblanc's W are on about the same cooldown. This is the only way leblanc can trade with a xerath. He has long range and can poke easily. Bait out his stun by using your W and then trade/kill. If xer didn't have stun I would say this matchup is easy, but if he hits you the trade will be lost most likely. Keep out of range of his W and dodging his Q is how to have the ability to go aggressive against this champion. His long range is hard to deal with early, but your gap close once you hit 6 allows you to have kill pressure on him, play around the map. Push Xerath to facecheck into areas that are dangerous for him and stay active on other parts of the map. This might seem difficult because of his wave clear, but try to find opportunities on bases and look to clear the wave quickly. Most Xeraths will play so far back that it's difficult to go in on them.
Rough matchup. Anivia has better wave clear, a broken passive, a slow, and a stun. This champ is scary to lane against. Repeat ganks are important against this champ. Once her egg is down you have a chance. Her R + E combo is easy to hit and does a lot of damage, but as long as she doesn't have egg and you don't get hit by her stun you can win a 1v1. More than anything get ganks and roam when she backs, Anivia is one of those low mobility, and wants to farm kind of champs. Don't play her game and look to get active on the map in other lanes, it's obnoxious trying to solo kill this champion.
DIFFICULT DIFFICULT DIFFICULT. Her W stops your W and she negates your mobility and your passive with her ult. Try to play around with your Q proc by using your E. Liss has better wave clear and will win trades if you W in on her. Jungle help doesn't do a lot for this matchup unless you can land your e on her. Your E has a far range on it and if you W forward or already have an aggressive position on her she cant E away without being stunned or burning her flash. ALTHOUGH, Liss is not bursty. If she blows her W farming then you can all in her. Even if she ults you she does not have the damage to kill you. (Assuming equal in gold). Lissandra is also killer with her jungler and can follow up any gank with her ult. So if she Es foward just W back. Use your ult if you have to. Good lissandras can combo their ult and w together to keep you in place for long enough to kill you with their jungler. Leblanc is more bursty, try to use that to your advantage by looking for quick one shots from fog before she ults. Liss is good at roaming, keep your team informed on where she goes as her wave clear is pretty good as well.
Do not trade with this champ when she is walking forward. Her auto attacks hurt and if she starts E early game she can negate a lot of your damage. Overall you have more single target damage. Ori has short cooldowns on her ball movement. Which makes them think they are safe to use it to farm. As soon as she moves her ball then go in to trade. She doesn't have a lot of threat on you, but she is VERY safe, disgustingly safe. People pick this champ because she's so easy to play and it's difficult to get kills on her. However, Leblanc's roams are still a notch about Ori's. Ori isn't easy to solo kill, get vision control and set up your jungle to gank. If the ori took barrier like the dirty ori player they are, only go for the kill with champion advantage, otherwise roaming is a more productive use of time.
Total skill matchup. Yasuo can E to your clone and can wind wall your abilities besides your W. Play between his wind wall AND between minion waves. This is because if you Q W early he can E to your return pad and out trade you. This champ is just so insanely broken, I haven't got a clue how Yasuo got into the game. You have to be QUICK with your chain in this matchup and you cannot make it obvious. Make sure you auto attack to get his shield down, do NOT use abilities, it's a total waste. Try to lead off with your E, so it's less likely he'll wind wall it. Otherwise hold your E until he goes in on you. Yasuo isn't amazing at escaping ganks without minions and his roams suck. If you're confident in this match up then look for the chains and wait out his wind wall or player around it. Otherwise roaming is sick.
Although his Q does make it hard to trade, you still out damage him. Kassadin is very weak until he gets a few items. Only in the mid-late does he win against leblanc unless he builds hard mr and health, even though this is unlikely. Playing aggressive early game and pushing your advantage is important. Like most late game champs punishing early laning phase is important. Kass's lack of wave clear until mid game makes it easy for you to control the wave and to roam. Contest every single crab with your jungler. There's no reason Kassadin should ever be the reason someone is getting a crab. Once he hits 6 it becomes hard to kill him, but you can still follow him with your W + R. He has no hard cc to stop your combo and out trading him should be easy early on. Snowball other lanes from his lack of wave clear or punish him by denying cs or by killing him because of his weak early game. He's very difficult to play against later in the game.
Karthus in lane LUL. If someone is still playing Karthus mid then they are just hard trolling and it should be the easiest lane of your life. Dodge his Q's and you're set. There's a million ways to get solo kills.
Hard matchup. Once he hits 6 your kit means nothing. His combo can easily one shot you if you're going for a squishy build. Banshees isn't the worst item against him, maybe even a qss if you find yourself with extra gold. Merc treads are even a good idea. Malz has good wave clear and out trades you. Communicating with your jungler for a gank is a must. He is still immobile so roaming is also a good idea when he backs. Otherwise he will shove quickly and your loses will be huge if your roam fails. This champ is brain dead.
There are two ways to play this matchup. Extremely aggressive or extremely passive. Playing passive isn't a way to play leblanc and gives teams leads. Especially against vlad. So keeping him down from that late game monster he can become is a must. He does have sustain, but play safe between your cooldowns and trade when they are up. His E and his pool will decrease his health when used. Playing aggressive and forcing these out early game will win you the trade. This matchup can look dim, but committing to an aggressive play style can win you the lane. Don't be afraid to dump your abilities onto this guy, he's gonna pool and chunk himself anyways. If you play too passive, he'll just heal back up to a point where he has pressure on you again. It gets to be a lot more difficult once he finishes visage. Look for other places on the map to make an impact at this point.
Total burst matchup. His stun is easy to see and easy to avoid. Use your W to avoid his stun and stand behind minions to avoid his Q since it isn't targeted anymore. (Minimum two minions) Play aggressive early. Veigar takes a long time to scale. Banshees isn't an awful idea against his stun and damage. Late game it's a battle of who is faster and who can one shot who first, the lane is super easy though.
Extremely annoying. One of the more difficult lanes to play against. Lulu has so much survivability and she has polymorph. Not only can she shield your damage and increase her own health if she gets in trouble, but the polymorph makes it incredibly hard to kill her and can ruin your return to your pad. This matchup is similar to Lissandra although Lulu doesn't have a lot of kill pressure. You still out damage her which means play aggressive. Although try to avoid using your W to get onto her because good lulu players will Ult to cancel it if they're in trouble. Using it when she has more health is ok, but the name of the game is speed. DON'T DO THIS LATE GAME. unless you wanna experience the antifun that is Lulu's point and click poof you're useless skill. Better to roam against this champion. Late game is a death sentence. You won't kill her unless you're really fed or she's by herself. Lulu is a support champion. Try to catch out easier targets.
Take E early on in this matchup. The only way Talon out damages you is if you get to close. Using your W on top of him isn't as great as using it on other champions. You can level 1 before he has Q, but after that he gets a fat crit every time you get to close. Play distant and keep your chain ready for when he goes in. He doesn't have a ton of kill pressure on you. Keep the wave trimmed as Talon's love to roam and is one of the few champions who does it better than Leblanc. Keep good vision and make sure your teammates are alerted when he could be roaming.
The only way Vel'koz can win this lane is if Leblanc plays passively or he predicts every Leblanc W with his knockup. Which is unlikely, but possible. Vel'koz is very easy to lane against. Also very easy to kill repeatedly. If he ever trys to knock you up use your W to escape it. Once Vel'koz uses that he doesn't have a good chance of killing you. Using your W+Q+R+E or W+E+Q+R combo repeatedly can alone win you this lane. DODGE HIS KNOCKUP. His knockup range isn't far enough to hit your return pad and if he walks towards it once you W in then walk away in the opposite direction and don't return to your pad. You don't have to roam a lot because you have a very killable opponent in your lane. Play aggressive. He still has better waveclear so playing passive will most likely put you behind.
Skill shot city against a champ with targetable spells and high mobility. Early game wait until he autos minions and Q+W him. Once you hit 6 he will most likely be playing farther back so W+E+Q+R will make up for the distance he is keeping. Start with the chain if he isn't close to a tower, end with the chain if he is close to the tower. He doesn't have hardly any kill pressure on you unless he pokes you out. Dodging his skillshots is a must. Even with the buffs to Ziggs he still has high mana costs. Play aggressively and making him use a lot of spells defensively can win you the lane. He still goes oom easily. Either play aggressive or push very hard to roam. Ziggs is still very strong late game.
Extremely easy matchup. Ekko is very weak to high burst champions. Leblanc being able to one shot him makes her an easy counter pick. A long casting time on Ekko's Q and high mobility on Leblanc makes it easy for her to escape from the majority of ekko's damage. Hard bully pre 6. If ekko ever goes in on you then it's an easy kill/chunk. Land your chain once he uses E and keep your distance from him. His passive does hurt. Once ekko has 6 he has pressure if he goes in then backs out. Only because his clone will walk up. Just avoid his clone and dash out of his stun whenever he casts it. His stun is a long cooldown, don't fight him if he's using it randomly.
Will win in a prolonged trade if you don't use your W well. Try to distance yourself from him enough so that his abilities can't reach you when you blink back after trading. You can either play in his face or let him farm. Use your W to dodge his Q and you should win every trade. That said, this champ is annoying in the early levels. Once you have some abilities you can start to get on top of him. Try to play so you don't have to return to your W pad in a straight line. What I mean by that is, play at an angle to A sol, this allows you to dodge his stun by either walking off or pressing W to go back. This does require some reaction.
Not a crazy hard matchup. Landing your chain is once again important, and avoid prolonged trades. Bully early in bursts, and take time to roam.
God this champ is no fun. You ever go to the ice cream truck to get something to eat and then realize it's actually a taco truck, but you don't want tacos because it's hella hot outside? That's kind of what playing against Galio feels like, Galio is the taco truck that you never wanted. It seems like this champ will never go die will in lane. He's a little too tanky to kill on your own and he has great set up with his jungle if you blow your W. Player with your jungle to get kills, otherwise find kills elsewhere.
Leblanc is the best champ in the game, you don't stand a chance.
Another super cool champ to play against. Heimer is a squishy boy, look to go in on him once he blows his E, but do not play around in his turrets. If you get stunned, it's a death sentence. Don't ask for ganks, it's an easy way for you and your jungler to die. Look to make things happen elsewhere or keep up on trimming his turrets and look for those opportunities when he blows his E.
Lucian is a hard lane bully. It's best to avoid fighting him until you get later in levels. As he doesn't have any cc, he becomes very killable later on. Look for plays with your team.
Qiyana isn't extremely difficult, but she can catch you if you facecheck carelessly or if you get to closer to her. Qiyana is best in all ins, play slowly with her. Look for opportunities to hit her when she walks up to cs or after she has used her E. AVOID WALKING CLOSE TO WALLS. Her ult messes with your W.
Neeko is a lot of fun to play against. The only issue is her snare is nuts against leblanc. Playing in minions is actually awful against neeko. Try to get vision on one side of river and then play to that side. Her snare range increases once it hits minions and her Q will proc more in a minion wave. This will cut her damage a lot. This matchup plays very similar to Ahri, but you must hit the chain on her. If she W's and disappears you need to know where she goes and which one is the real one. The chain helps with that. Try to save your W to get out of her ult or to finish her off, as your ultimate has a massive AoE and she will follow you back given the opportunity. If you get ahead it's super easy, but she has a lot of threat.
Sylas is a threat because of how tanky he is and how easy it is to set up a gank with his jungler. When Sylas steals your ult, it's the last ability that Leblanc used. Keep this in mind when he does because he could close the gap very quickly or cc you even more. You can win early game, but throughout the game you need to have happy feet. If you can dodge out his E, it's a very winnable lane.
Twitch is a cheese pick. He's gonna try to shove and roam all over the map. It's a complete gamble whether he goes off and carries the game or if he's completely useless. If you can prevent yourself and your team getting killed in the first 10 minutes then you will win the game. Twitch is troll in regard to the fact that he loses a ton of xp and gold when he does these roams. Keep this in mind, whenever he goes missing then make sure your team knows. Keep wards on pixel brushes on both sides of the river and make sure your jungler knows as well. Twitch will hardly ever be able to kill you unless he's mega fed.
Zilean isn't a champ that is ever going to have a ton of pressure on you. He has one way to damage and cc you and that's his bombs. Use your mobility to dodge the second bomb, you can get hit from one. It isn't a big issue, just making sure you're giving it back to him a lot more. Play aggressive early and don't let the game get to the point that he is ulting every 2 seconds in team fights. Zilean is only good playing with his team. Coordinate with your jungler to pick up EXTREMLY easy kills.
Zoe is DISGUSTING as a champion. She isn't crazy oppressive, but when she starts duplicating all the summoner spells used in the last ten seconds, it's a little nasty. You want to kill this champ as fast as possible. She doesn't have a great way to dodge out your damage, but prolonged fights are not ideal and the sleep is extremely dangerous. She's a little slow roaming, but her roams are just as strong. Keep this champ down and avoid her sleep as it will contribute to getting most of her damage.
Sorc Boots are a somewhat more obvious build path. Building early increases your damage in trades and your ability to roam. Can build first, but only against champions where movement is essential. I'm talking about playing against TF to get away from his card, Olaf to out run him, champions with skillshots where you need movement speed to dodge them.
+ ARE THE BREAD AND BUTTER OF LEBLANC. These items allow leblanc to become a destructive force. Giving her the ability to one shot carries and snowball leads. Ludens is always the first item in the build path, it gives you so many good stats like mana, ability power, and CDR. CDR is god on Leblanc, it's all about having high mobility and CDR enables that so much.
This item is god against AD mids like yasuo, zed, and talon. If this item is used correctly it can negate their all in and I would advise building it first or second against all AD assassins(not AD carries like ezreal). Hourglass or Banshees should always be a build item on Leblanc. It allows her to make aggressive plays and live through it. Getting caught by cc or just trying to dodge a global ult hourglass helps the squishy nature of Leblanc. Also later in the game her W cooldown is so short that by the time her hourglass turns off she can W out of most situations(unless caught by cc).
This item is so strong against comps that have any mr. Although it is situational when to build this item. Most of the time I find myself building it third or fourth. Depending on how much mr is on the other team(which is something you should be checking through out the game). If my lane opponent builds any kind of mr as their first item or a jungler rushed an early MR item then I would build Void Staff second. And I mean crazy tanky MR items like visage. Keeping your assassination potential up is a must to create pressure on the map.
I do describe this under the notes page on the skill order, but just to be clear. Taking your E third and your Q first is usually a bad idea. The reason being that early game Leblanc has high mana costs and trading with 3 abilities early game can make her go oom very quickly. Not only that, Q draws minion aggro when used on a champion. Instead of putting that extra point in E I suggest putting it in W. The reason being that Leblanc is a roaming champion and she has poor wave clear. She is strong when she is roaming and in order to do that she has to clear the lane quickly so she cant return before the enemy laner has a chance to clear the wave and make you lose cs. Clearing the wave quickly can also create pressure on the other laner to farm under tower or to prevent an all in from the enemy laner because of you having the advantage in the minion wave. The rest of the game I suggest maxing W for wave clear and roam and then Q for the burst.
Early game pre 4 your combo will be Q + W. ALWAYS MAKE SURE TO AUTO BEFORE YOU W BACK IF YOUR OPPONENT DOESN'T HAVE HARD CC. Early game autos are strong and do a lot of damage. They can win trades because people underestimate them on AP champs. This combo is very strong early game and can win trades against most mid laners without shields. Once you put a point in your e it's all about hitting the chain. Whether that's in a trade or if you have a jungler coming into gank it's about landing your chain. If your opponent is out in the open E first and then go in for the Q + W combo. Walking up after your chain lands is also a must. This is because if your enemy flashes then the chain will still be on them. Making it impossible for the enemy to escape. Later in the game though you probably won't get the chance to get close enough to land your chain first. This is when your W comes into play. Late game your W becomes a gap closer. The combo to dive in from a flank and attempt to kill a carry will be W + R + Q + E. The reason the chain is after the Q is because you most likely won't have the time to let the second part of the E to go off. So activating the sigil with your E at the end will kill most carries late game or create enough pressure to zone the enemy off of objectives. The key is being fast though. Practicing this combo over and over can win you games off of one play.
There are really only two more combos to leblanc. The first one being the "One shot". This combo only works if you have vision control or at lower elo. The thing about this combo is that they have to be close for it to work. This combo is Q + R + W. Some people might question why I don't throw out the chain and that is because it will give them more time to react. If I know they have flash or if I know I can't one shot them with just Q + R + W then I will throw out the chain FIRST encase they do react and flash away then my chain will still be on them.
Basic Combo: (Early Game)
Pre Level 6, Post Level 3:
Late Game, Assassinating far away carries: Q And R can be interchanged
+ + +
One Shot Bush Check: (No Flash and are squishy)
One Shot Bush Check: (Have Flash or tanky)
+ + +
The go to spell for assassins. Gets kills and snowballs leads by itself. Very important to secure kills and to gain advantages. Burst champion needs a spell that does damage.
Another important aspect is where to place wards. Try to figure out where their jungler is starting. To do this see who comes to lane first top or bot. Whoever comes late is most likely where their jungler is starting. Although, you should also take into account what champions are top and bottom. Determining where their jungler will be once he hits lvl 3 will determine where you place your ward. Try to place your ward where it will see paths from the river, and from the enemy's camp. The corridors that lead to dragon and baron are the best places to see. Champions that can dash over walls will still be spotted out and make sure you're warding towards important objectives that you want to take. For instance, if you want to take bottom tower try to establish ward control in the bottom jungle, do this with your support or jungler and communicate that you're doing this, or if you want dragon then set up wards both in dragon and around it.
One thing about blue bluff is that it is extremely important on leblanc. Another thing about blue buff is that leblanc is very good at killing it. Once you hit 11 you can solo blue buff without your jungler. It might be tedious, but having blue buff allows you to roam and to spam poke against the enemy mid laner. Mostly roaming. This is because it's great if you win lane and everything, but if you roam bottom and that ashe, vel'koz lane gets a kill then it is going to make it a lot easier to win the game by snowballing not just yourself, but your team.