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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.
Since champions like Jax are most effective when built hybrid, crit chance and crit damage are just ineffective. The point of critical champions like Tryndamere or Ashe is trying to get the entirety of your damage doubled(or more), because these champions are heavily reliant on basic attacks, but on champions like Jax, this just doesn't work, he has too much magic and is too reliant on skills. Building Jax with critical is beyond unnecessary, it gives him less damage output, limited item options, and no survivability. This is why we skip Lethality and Deadliness. Try to keep this in mind while reading the rest of the guide.
Runes are not absolutely necessary on any champion!
These runes will cost you over 20k IP for just one set, and I'm recommending two sets. Don't worry too much about the runes.
First of all, the runes I am recommending for Twisted Treeline are as follows:
Greater Mark of Strength,
Greater Seal of Evasion,
Greater Glyph of Force,
Greater Quintessence of Swiftness.
These runes are specifically for Twisted Treeline for a variety of reasons.
is for about 30 early game health and much better early game killing and harassment power. Jax's skills scale greatly with attack damage. You'd be surprised with how effective these are. It's like starting with a free Long Sword.
will give you about 7% dodge, which is pretty sizable in comparison to the 20-ish you'll have with your Ninja Tabi and Counter Strike. The three combined will almost guarantee you a Counter Strike every time it comes off cooldown and a constant Nimbleness while in battle.
gives you a steady boost of AP every level which will scale well with all of your skills. It's not absolutely fantastic, and it's not to say nothing can replace them, but Jax doesn't need cooldowns at all, and the extra magic resist is kind of unnecessary on TT because most of the damage there is physical. I prefer the extra burst, and I do feel that it is the best option in any case, but you can do what you want with these.
is the best rune you can get for Jax. The extra movespeed is incredible. Playing Jax with these and Nimbleness is incredible. People will have such amazing difficulty running from you or chasing you.
Runes for Summoner's Rift will be slightly different, retaining movespeed and dodge.
Greater Mark of Alacrity
Greater Seal of Evasion
Greater Glyph of Warding
Greater Quintessence of Swiftness
will help your jungling more than attack damage runes will. They will also help you shift focus in the bigger team fights that occur on Summoner's Rift.
Seals stay the same for the same reasons they are used on Twisted Treeline.
will help you against the slew of mages you will inevitably find on Summoner's Rift. Those AoE casters dominate this map and you'll need all the magic resist you can get.
Well obviously, since Jax is most useful when he dodges, the boots i recommend are the ninja tabi's. Since they add 12% dodge. And with all those dodge runes, you will be dodging alot. Also one thing that kinda sucks about Jax is that he is item dependant. Once you have enough gold I usually get the Guinsoo Rageblade because that plus your ultimate, your attack speed will be increased. Then I go after the hextech gunblade because of the ability power and attack damage. Then the Rylai's because once you attack them, their movement speed decreases. Trinity Force is next because, well, it helps out every column. And bloodthirster for the lifesteal and damage. Once you complete your build, you should be unstoppable, just dont try goin in a 5v1, no one can survive that lol.