[Autumn]

It should be noted that HSDW currently offers a tactical advantage as well, being able to output an invocation freely on your turn instead of needing to commit to the option of using the invocation, this also enables strategies where in you are allowed to move away and then cast at the same time, which can differ greatly from casting in someone's face.

Greaper already applying to other class' invocations offers enough of an advantage to give Evoker an edge if you want to be a Divine Shower spammer at all. So no I don't think HSDW should apply to Divine Shower, as Divine Shower's immense strength is held back a bit by not being able to cast it back to back to back, and instead it has at least a 2 turn down period in which you must spend a full 6m to cast it again.

Evoker/Priest under HSDW would suddenly go from being a primary nuisance in a fight to being an outright balance issue. In it's current state. As unlike the Evoker invocations, Divine Shower is conditionless AoE damage to the entire map, alongside a blind, and it ignores evade too because why not. Divine Shower's momentum Efficiency will be that you do not have to spend additional momentum on blink to hit an intended target if they should move away.