A small clarity issue with Mordekaiser

I just played a game against the new Mordekaiser the other day, and an obnoxious aspect I noticed is that it's more difficult than it should be to tell when he's actually using his Q. I wanted to trade with him between the cooldowns of it and try as I might, I couldn't tell when he had it activated.

I'm sure there was an audio cue I might have been missing but the particle effect of his empowered ability is really faint and I feel like the game shouldn't rely so heavily on audio cues as I have friends who play this game that are hard of hearing.