I don't think we *need* it, and I'd hope they could be a bit more creative than simply "here's 5% more raid damage".

I mean, a more fun one would be to let Stone have a chance to generate lilies, and at 3 lilies unlock a new instant cast high potency attack that uses all 3 lilies (maybe "Drown" or something since we have all of one water based spell right now). If the goal is to give WHM more damage contribution, that'd do it without simply copying what AST does and gives us a more interesting button to press (or not press if you want to DB at that point instead).