User blog comment:JBox2D/Tank killers/@comment-24420226-20140225201711

The probelm is that most of the current "Anti-tank" tools like %hp and armor shred are not any less effective against non-tank targets. A champion completely focused on these tools will inadvertantly do as much-if not more- damage to squishy targets.

The closest thing we have to a properly balanced anti-tank is Trundle with how he steals stats away. He penalizes tank-focused building, but becomes less effective against squishier carry-type champions. He can't steal armor and health that the enemy doesn't have.

The other thing Trundle has is the ability do decide how long a fight goes on for. Tanks typically do well in longer, more sustained fights, obviously as focusing on tank rather than damage items means that they can neither kill or be killed very quickly. Trundle's pillar means that before he starts losing the trade once his buffs wear off, he can press the button to cleanly disengage, wait for cd's, and do it again later.

I think that more important than %hp or armor shred is an ability to prevent longe-winded skirmishes. An anti-tank focused champ's kit will revolve around a poke-burst-disengage cycle. Specific needs are short cd's, good resource sustain, and a strong slow that prevents being chased down. Ignoring the raw damage the current Xerath has, his kit is a very good example of how an anti-tank kit might be built.

Vayne is also actually very close to this, if you think of Vayne more as a caster than an adc. You would auto attack, reset with your tumble, get as many silverbolt procs off, then wait for the tank to get too close and condemn them away (ideally, the condemn would deliver a third silverbolt stack). The only problem is the length of cd on condemn makes Vayne very vulnerable while it's down.