Just imported an old suggestion back at DA and slightly recolored it to create a smoother harmony with skewer.
The current in-game empower icon is overused. Suggested icon is the current skewer icon and the old mighty swing(dif color). Since it got changed and now gives both cleave and damage boost the icon seems to fit empower better now.
I also edited the icon a little and made the blaze resemble shockwave more. Original Idea
I tried creating an icon that will show a tusk/horn piercing something similar to what the skill is doing.
it now shows a tusk with a fiery trail following it.