I'm know I'm showing up late to the party, but
Jax is my favorite champion so I thought I'd give my $0.02 about him in S3.
First off,
Blade of the Ruined King is an excellent item on him, but I wouldn't say it's better than a
Hextech Gunblade. The
Leap Strike,
Empower and the proc from
Grandmaster-At-Arms combo will deal significantly less damage with
Blade of the Ruined King than it does with
Hextech Gunblade because they scale mainly off ability power. The trade off is that your auto attacks will be much faster and the active on the item is better. Picking between them is situational, but you should rush a
Bilgewater Cutlass regardless of which you decide on.
Secondly and important to this specific topic is that
Ravenous Hydra is quite good on Jax under certain circumstances. I would never rush it and wouldn't consider it for my second item either. It's very effective in games that have 3+ melee champs on both sides because people will group up more and it's harder to focus Jax. Since it's harder for them to focus you, the sustain easily makes up for durability lost and the frequent AoE damage is awesome. I wouldn't get Hydra until you have your BotRK/Gunblade and an attack speed item like
Guinsoo's Rageblade,
Trinity Force or
Zephyr.
As an aside, I love
Zephyr. I get
Boots of Swiftness and coupling that with the defensive masteries and Zephyr you are difficult to CC -- important for Jax.

First off,








Secondly and important to this specific topic is that




As an aside, I love


Since this has been necro'd, gonna take advantage of this thread and ask something that has been bugging me about
Jax. Nobody seems to build
Sunfire Aegis on him.
People go for
Warmog's Armor even though he's an in-your-face all the time champion, which makes the damage proc from the cape valuable. HP and Armor to boot? Awesome.
Why?
Also, title says Jaz, just noticed.


People go for

Why?
Also, title says Jaz, just noticed.
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I'm told
That was S2, not S3. In S3, you rush it.