I had a really simply idea come to mind.
When you think about how energy builders work, damaging the enemy and getting energy for it, wouldn't it fit really well with the Dark and Infernal sets to have alternative energy builder powers that work like Lifedrain and Life Essence? Imagine that, instead of projectiles coming from you and going to the enemy, the visual effect comes from the enemy and goes to you, like you're pulling energy out of them and recharging yourself with it.
What could they be called though?
The Darkness one could be called "Energy Drain", or maybe "Soul Drain" or "Spirit Drain", and the Infernal one could be called "Soul Essence" or "Spirit Essence" or something more clever than I can think of right now, and these energy builders could use Psi Lash's character animation, or the one those constructs use.
Thinking about Lemurian constructs, a Power Armor one could simply be called "Power Drain". Drain power from foes to restore your weapon energy!
0