Do kayles waves count as a auto attack or a ability?

Its on hit effect and riot made it not possible to critical stike (the true damage it self) also not having interactions with quinsoo rageblade ( you still appl the magic damage from E passive but not the critical from your passive).

The wave is an attack effect, which cannot be affected by on hit damage like Wits (that damage simply goes on the auto, but wits lowers the target's mr, meaning the wave can do increased damage until level 16, where it becomes true damage), or effects like Phantom hit on Rageblade.

waves count as an ability in respect to effects that apply on abilities like rylai's or luden's.