Thanks for your comment. I just want to ask you - when you sad that you level your Defile as much as your Lay Waste I assume you speak just about Dominion, don't you?
I always maxed my Lay Wastes before Defile in Summoners Rift and when I came to Dominion, I didn't think about it any more. But if you say that it works even if you level both spells simultaneously, I will try it in few games.

I like the idea of moves peed quints, I do the same thing with karth, along with your seals health per level and cooldown. All make for a great utility to help get to points fast and stop caps with your ulti. Promote and ghost is what I take because i level my Defile as much as my Lay waste. When you do that you can run past minions and kill them instantly die on a point and kill any enemies with defile on while your dead. Over all a good guide nice work. Maybe ill make my own sometime

It's true but I think it's better to buy Boots of Mobility.... then I haven't enough money for Prospector's Ring for start. I understand your arguments and as I sad - it's about playstyle. I definitely don't say that Clarity is the one and only good option, I'm just saying that this is a way how to play.



I can play many mages, it's my favorite role. I have played many games with Karthus, Anivia, LeBlanc, Swain, Morgana, Brand, Malzahar etc. I AM ABLE TO MANAGE MY MANA. If I play without Clarity, I it isn't big problem for me. But I don't want to do this. With Clarity I can play more aggressive. That's my reason why to take it. I don't play with Clarity because I MUST, I play with Clarity because I WANT TO.



1 Wall of Pain + 6 Lay Wastes means one great offense which can kill enemy. Or it can be 9-10 Lay Wastes which is great harassment.



I don't think so. I definitely consider the Teleport as great spell but it's not true that it's in 100% of circumstances better than Clarity.... if it would be, there is no Clarity in the game at all.
Teleport has longer cooldown than Clarity and even if you can use if for mana regeneration in base, it takes quite long time to do it (about 15 seconds). So I don't say that Teleport is bad but it's definitely not better in 100% of circumstances.

1/ and 2/ : Thank you very much. You are right in both, I correct it. I am grateful for your correction!!

3/ Well, good question. Karthus is really good defender (much better defender than capturer). So I mainly defend but I need speed for defending more capture-points (or sometimes I attack, of course). I can stay under the tower and put the Wall of Pain across the enemy path - they must pass it and I can easily kill them with low MR. Due to Karthus' AOE it's quite easy to damage all champions who are taking the tower AND even if I die there, I can interrupt their channel for 7 seconds (every second counts). Overmore, I can help attackers even if I'm defending due to my ulti.
Karthus is not so good attacker because he is squishy which makes him vulnerable by the tower-shots and he can't face 1 vs. 1 some champs like Warwick, Jax, Master Yi, Vayne (and many others ADs) so I don't think it's so good to roam with him all the time (I of course roam much as everybody does but I prefer defending).
You can maybe ask me why to play Karthus in Dominion at all because he is in 1 vs. 1 fight weaker than many champs and great teamfights are very rare there.... well, all that champs who can easily beat Karthus in 1 vs. 1 are ADs (except of Veigar but it's pointless to play Veigar in Dominion because he is anti-AP but the most people play AD in Dominion); that might mean that it's better to pick some AD but if everybody takes AD, Thornmail (and similar items) can easy destroy that team.
So somebody should play AP and if I think about APs suitable for Dominion, I get several good champs (APs for Dominion): Karthus, Swain (with some AP-offtank build), Brand, Ryze, Heimerdinger and Kennen. And I play Karthus because I like him the most (despite that I consider Kennen as the best choice for Dominion - but I hate Kennen xD).

Health packs and a HUGE MP5 boost is in dominion. If you're running out of mana you're doing something wrong...
I understand there's a lot of fighting, but as I've mentioned before, just picking up a Prospector's Ring if you can't manage your mana properly is MUCH better than wasting a summoner spell. Even if you are staying near a point and fighting constantly, that means you're always near a health pack, and even then, the insanely high MP5 rate means that you can spam bombs without it really affecting your mana.

Karthus is really mana independent on both maps and in general - and when you add a generally terrible summoner spell to the mix, it's just odd...

Practice conserving your mana or something, I don't know how you manage to run oom on any mana champion on Dominion to be honest...

Also, on SR, you really can't harass that much more with Clarity. At level 5 you'll have 160 + (30x5) extra mana, 310. That's like one wall of pain and 6 Qs. Teleport is better than it in 100% of circumstances on SR.

I know that many players think that and I admit their arguments but I think it's about playstyle. I have played Karthus without Clarity and I have Karthus with Clarity. Both posibilities in many games. If I know that I don't have Clarity, I save my mana so I don't run out of it. But if I have Clarity, I can be much more aggressive which is good for me. I don't say that it's the only possible and only good way but it's one of many good ways how to play him.



I maybe didn't explained it so clearly as I wanted to. I mean that if I get some Flash or Ignite, I can kill easier but I can't stay on the map as long as with Clarity.
In Summoner's Rift you definitely can hold you lane, farm the minions and keep Karthus on full mana. But with Clarity you can harass your opponent much more than without Clarity.
But in Dominion you are moving, fighting, moving, fighting, moving, fighting, moving, fighting.... you have almost no time to stay there and farm minions (yes, you farm sometimes but not much).
The fight cost you a lot of mana, moving restores you something but definitely not all you spent on fighting. It means that Clarity allows you to stay in the frey more time (which is very important in Dominion).

I can understand the reason for Clarity on Karthus, he runs through mana like a beast; and if you are as squishy as him when u run out of mana, your pretty much a certain kill. However, there are a few things that i think you should adjust in his build.
1-Fix the seals, right now they are marks.
2-Your comment on the rapid use of lich bane needs correcting, with a 2 second cool-down on lich bane, you do have to wait a moment before it works again.(yes i know it is a very small amount of time, but wording is important.)
3-Not a very direct thing, but what exactly is karthus's role in dominion for you? is he moving around the map much or is he basically controlling 1-2 turrets that are already under your control?

Though I won't vote on this guide, Clarity is a very outclassed summoner spell - on both maps.

The increased regeneration (and health packs, might I add) on Dominion means you'll never run out of mana, especially with a Prospector's Ring, which you should get if you're having mana problems.

You "explained" it as - "because capturing/defending is much more important than killing", which makes no sense, since if you have mana anyway, having more (useless) mana is worse than having another summoner spell.

OMG, so troll.... can you, please, read my reasons why I pick the Clarity? And if you disagree, can you write the reason here? Or you just heart somewhere that "Clarity on Karthus is so nooobish" and you downvote just because.... trolololol?
Clarity is great spell in Dominion. You can't keep your mana by farming minions there (which is the reason why many players often don't use Clarity for Karthus) and you need to stay on battlefiled to conquer or defend towers. This spell might be the difference between "staying under the tower" and "returning to the base and giving the tower to enemy".
It's quite funny that you downvote my guilde for "Clarity on Karthus" because you know that some good players don't pick it but you don't even know the reason why they don't pick Clarity for Karthus (because of Defile's passive which can ensure your mana in Summoner's Rift but not in Dominion).
Well, everybody meets his troll sometimes, I just have met xD. Coul I ask you if you even read the build before downvoting?

clarity on karthus...