I like the aspect idea mention above.

Although i would treat it kinda like a bards song combined with AST sects.
Aspect of Water would increase the potency of HoTs.
Wind would increase potency of DoTs.
Earth would increase the effectiveness of...
Protect, make it a WHM exclusive again. Its so neglible as it is, but it could be WHMs USP. Stick it on a cooldown, have it only last a minute, and them WHM becomes the sustained, minor mitigator, instead of the superior situational mitigation of the other two.