Talk:Essence Loki Helmet/@comment-189.192.135.2-20130628211351/@comment-7704578-20130630055949

That is probably why the webpage reads:

"

As of patch 8.2, Power Efficiency is now affects a linear change in ability cost. It is currently unknown how multiple Power Efficiency items stack.

Therefore a 15% increase in Power Efficiency will cause all abilities to cost 15% less energy to activate.

Obsolete math follows:

"