Talk:Jarvan IV/@comment-3578129-20130311170308/@comment-128.153.216.214-20130311224406

Don't bother stacking penetration; you won't find very many worthwhile sources, and his Q shreds armor plenty as is. An early Brutalizer alone should be fine, although if you have a lot of physical damage on your team, a Black Cleaver upgrade is not a bad idea. That being said, if you have someone on your team who can stack it faster, like Renekton or Zed, just wait for them to grab one.

As far as AD goes, Triforce is strong for supplementing his burst damage, while also giving him decent sustained damage and Phage procs, Hydra works well with his ult, Maw is a decent anti-mage/offense item, and Ruined King will make J4 a half-decent duelist. Zeke's gets an honorable mention just because it's fun to give your entire team AS, Armor, AD, and lifesteal.

End of the day, just assess the situation you're in and build accordingly.