[Poruku]

Considering red rain's main use currently is to waste 5% of your hp, it would be nice to see it become a real tool to stack claret calls. As it is currently, you're lucky if you get 2-4 applications out of it to your intended target. Not only is it easy to avoid, it's not really worth avoiding :^)

keep it at 3m, 5% hp cost, no fp cost
1: Red rain affects the entire battlefield for 2+rank rounds
2: Applies claret call three times on cast and every round

Considering claret call is only +1 damage per hit, I wouldn't say this is too strong. It would combo strongly with rebound, yes, but there are much more efficient ways to do this (I.E. the blood spells) that do more than just stack clarets. If you're gonna spend 5% hp just to get claret calls, it might as well do so reliably and stack multiple of them. Besides, red rain across the battlefield! That's cool!