Hmm something like Kromog could be decent, the hands phase and the stone breath. Also blast furnace from melee damage of bosses and mini boss debuff too. Beastlord could be good for the adds and the little instances of damage from spears and his rumble thing as well as the DoT he leaves. Might have some application for Thogar, lots of adds and dots there which can be reduced. Don't see much use for other fights like Gruul, Oregorger, Blackhand, Flamebender or Iron Maidens though.
Seems slightly less situational. Would still like an offensive use.