Ezreal q says it applies on-hit effects and it's clearly a spell but the rylais slow and luden's proc haven't been working with it. No videos or pictures just something I've noticed the past few times I played him. Not 100% sure it's a bug but if it's not would someone explain why it doesn't, please?
its not intended to work with them it is considered an auto attack thats why his q proc damage from triforce without an actual aa
On-Hit Effects are like 
, they're things that can be applied via basic attacks.
Spell Effects are like 
and 
, and they are applied by spells.
In general, a spell can only apply one or the other. Since Ezreal's Q applies On-Hit Effects, it doesn't apply Spell Effects. Riot doesn't document this in the game, but they've confirmed this isn't a bug. The only person with a spell that applies both On-Hit and Spell Effects is 
Edit: PS - This is kinda nice for AP Ezreal as far as Luden's Echo goes, since it means that you can't accidentally waste the charge on a minion or monster. You either ensure it hits a champion by using W, or you intentionally opt to use it on minions via E or R.
