User blog comment:Typhron/Flushing Custom Champion ideas/@comment-7709681-20141110233822/@comment-60764-20141111170224

The damage doesn't stack or scale, so it's just a static 2% damage every second. It's meant to tick/taper/eat away at an enemy, with a Vayne/Kog'Maw element to give it a/the preference to deal with tanks.

To that end, Frost shots are meant for ADC's and APC's, being extra damage for squishy targets, and Lightning Rounds for Supports and Assassins. All hindering his ability to fight others, should they come up.