Talk:Nidus/@comment-73.171.123.166-20161227184101/@comment-17703786-20161228070806

Actually, he still benefits from max energy efficiency by way of making his casting costs for Virulence and Larva lower. This reduces the energy refund by a similar proportion, but the net result is pretty much the same - you need 4 enemies hit at once with Virulence to completely refund your casting cost.

The refund mechanic does make max power efficiency less pressing for Nidus, and once you have Zenurik's Energy Overflow up and running on a mission, or if you're using a Rage build, you'll be getting the required energy to spam his abilities anyway.