I'm not an expert on rune pages, however know this: while runes are certainly helpful, they do not replace the player. You could be playing against a person who spent 15k ip on their runes and stomp on them just because you play better. As for the attack order, when I play as jax, i find it successful to counterstrike, empower, then leap strike as coutnerstrike is about to stun. This way they get whacked across the face with a glowing lamppost, and are immediately stunned thereafter. It's less "obvious" when to use his ult, however in general use it when you believe you are in a fight where someone will die. By this i mean that if you think it will be a skirmish then run, such as
Dr. Mundo throwing a cleaver then running away, then dont bother. However, if a major teamfight is about to go down, you will want that ult up and running :D

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I'm not a great
Jax player, but here's my thoughts. Someone else would probably give better information, but here's what I think.
Runes:
While Runes may not seem like they make that big of a difference, they actually make a significant change early game.
9x
Greater Mark of Attack Damage OR 9x
Greater Mark of Magic Penetration
9x
Greater Seal of Armor
9x
Greater Glyph of Scaling Magic Resist
3x
Greater Quintessence of Attack Damage OR 3x Greater Quintessence of Desolation
Masteries:
21/9/0, look here. Possibly this, as I don't have a ton of experience with Jax.
Purchase Order:
Boots + 3x
Health Potions OR
Cloth Armor + 5x
Health Potions
Mercury's Treads OR
Ninja Tabi
Hextech Gunblade starting with
Bilgewater Cutlass
Guinsoo's Rageblade
Rylai's Crystal Scepter
Trinity Force
Situational Item
Skills:
To level 4:
Empower,
Leap Strike,
Empower,
Counter Strike
After that: Max R > W > Q > E
Combo:
Counter Strike,
Leap Strike, auto attack, then immediately
Empower, as it allows you to do 2 auto attacks in the time of pretty much one. You pretty much always want to
Empower right after an auto attack, when going for damage, as that provides great burst damage. If you can time it so that you auto attack, and then
Empower with your
Grandmaster-At-Arms passive procc'ed, then that deals really amazing burst damage.
Grandmaster-At-Arms is best used during a teamfight after
Leap Strikeing in, as it allows you to be extremely resilient when you jump in with
Leap Strike. It's a good idea to use it if you engage on your lane opponent. This allows you to shake off some of your opponent's damage, and can really surprise your opponent.
That's about all I know, if you want better information, I'm not the guy to look for. I just have knowledge of a lot of the mechanics of LoL, but I'm not a great
Jax player. Hope this helped!

Runes:
While Runes may not seem like they make that big of a difference, they actually make a significant change early game.
9x


9x

9x

3x

Masteries:
21/9/0, look here. Possibly this, as I don't have a ton of experience with Jax.
Purchase Order:











Situational Item
Skills:
To level 4:




After that: Max R > W > Q > E
Combo:









That's about all I know, if you want better information, I'm not the guy to look for. I just have knowledge of a lot of the mechanics of LoL, but I'm not a great


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RUNES: 2 greater quint dest, 7 greater mark of dest, 3 greater glyph warding
PURCHASE ORDER: dorans ring, tabi, rageblade, sheen, gunblade, rylais, lich etc as per a guide setup by Vasarius.
I know im lacking in the rune dept (ran out of ip) but I guess id like some input on my setup. Also, Id like some input on attack order..what I do now is empower then leapstrike. What im not sure of is when to activate counter strike and the ult. Ive asked other players ingame while I was playing xin and most of them focus on attack speed to proc rageblade and the ult....any help would be greatly appreciated.