Build Guide by I Main Katarina
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Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Im not going into alot of details regarding runes for Jax as I dont have a complete Rune Page for him but so far ive got Armour Pen Marks and Dodge Seals and will update this when I get the rest of my runes.
Also for abilities I get Leap Strike first then empower then dodge then lvl Leap Strike ASAP getting ult at lvl 6 once i have lvl 5 Leap i tend to either max empower or alternate between empower and counter on lvls.
I will admit that this build may seem quite expensive but should be easily possible on a 5v5 as I got this build in a 3v3.
Start with the Boots of Speed also buy 2 Health potion and 1 Mana potion. Then either buy Cloth Armour or buy Ninja Tabi straight away if you can after I have my completed boots I usually start on Guinsoo's RageBlade getting the Pickaxe first before getting Blasting Wand.
Once ive finished the RageBlade I usually go for Sword of the Divine because early game that extra magic damage is great early game but usually becomes inert when your killing everything in 1 or 2 hits (not including dragon or barron).
After completing SotD try to get Atma's Impaler normally other than the armour and crit its useless on Jax because the passive doesnt benefit you that much but at the end of my build I tend to have 3.5k health which makes the passive more useful.
Once I have the Impaler then I go for Phantom Dancer start of getting the Zeal than get the Cloak of Agility I think its called then save up to buy the Dagger and Phantom Dancer all at once. usually I go for it earlier but since they removed the dodge chance it kind of got less important.
Now here is where the rest of the build takes a while depending on how well your farming minions You should only have one Item slot left so work on getting Phage later saving to turn it into the always useful Frozen Mallet (you will have to save enough gold to buy The Giants Belt and Frozen Mallet in one trip to the shop its not hard if your farming well).
Then once you have the Frozen Mallet start working on Infinity edge at this point you wont notice that SotD is doing you much good so either farm to the point that selling your SotD will get you enough gold buy either buy Infinity Edge outright or just that BF Sword.
Once you have all these Items you will be a terror when it comes to team fights cause escape is hard from a Jax who slows with his attacks has a Leap as well plus Flash to make sure that any would be victim knows that he is doomed to a giant lamp post shaped bruise