I read somewhere on the forums that someone had gotten quite a few ring[1]s from atroce so the drops are definitely implemented, but yeah, no way to prove if its really 30% since people are lucky/unlucky and there's no way for us players to know for sure.
And a word of advice to any wizard seeking to take out Stormy... kill all bios in your way
or you know, wake up early when less people are online x)