Okay, just picked up Hero Designer and I'm pretty excited once I got it up and running!
I'm digging on the idea of a Heal power linked to my Endurance Reserve, allowing those points to go to the Reserve and not drain away again. This is the first iteration. I'm probably going to make it into a Charges power, too.
The Drain part as I created it in Hero Designer:
Entropic Skin: Drain BODY 3d6, Area Of Effect (1m Surface; Damage Shield; +1/4), Damage Over Time (6 damage increments, damage occurs every 5 Minutes, can be negated by Holy Implements; +1/4), Reduced Endurance (0 END; +1/2) (60 Active Points); Always On (-1/2*). Cost: 40
This is the part that puts it into the Pool:
Power Leach: Healing Pool of Darkness 3d6, Expanded Effect (x2 Characteristics, Body & Pool of Darkness) (+1/2), Reduced Endurance (0 END; +1/2) (60 Active Points); Linked (Entropic Skin; Lesser Power can only be used when character uses greater Power at full value; -3/4). Cost: 34
HERO Designer is pretty AWESOME.