LIFE ENERGY DRAIN: Each time an opposing character takes damage from an attack by Nemesis or Nemesis's Poison, Nemesis may heal 1 damage.

BIO NUCLEAR BLAST: Give Nemesis a power action. Draw a straight horizontal or vertical line of fire to any single square within Nemesis's range and line of fire, ignoring other characters for line of fire purposes. Make a ranged combat attack that does not target, and compare the result to each other character occupying a square along that line of fire, or a square adjacent to that line of fire but still within his range. Each character hit is dealt 3 damage.

(Bio Nuclear Blast description incorporates the Errata from WizKids into the wording from HCRealms' Unit section.)

Assume that Bio Nuclear Blast hits and damages multiple opposing targets. Does Life Energy Drain heal multiple clicks of damage or only 1?

Thank you for your time.

Multiple. It's pretty awesome.

I remember sometime around GSX, WK ran a promotion where you could run a colossal tournament and send in a picture of the winner and possibly win a prize. That was one of the very few tournaments I ever won in years of playing, and my team was Nemesis, Dark Beast and Trevor Firzroy.

(Ironically, I've always felt that all three of those figs are seriously underrated...)

Multiple. (1 for each target hit.) It's pretty awesome, it makes him crazy pushable.

I remember sometime around GSX, WK ran a promotion where you could run a colossal tournament and send in a picture of the winner and possibly win a prize. That was one of the very few tournaments I ever won in years of playing, and my team was Nemesis, Dark Beast and Trevor Firzroy.

(Ironically, I've always felt that all three of those figs are seriously underrated...)

My favorite moment running him was still when we were doing a 4 way match and I think I ran him at full points solo (I think). I waded into the middle of a couple of other teams and got knocked to my pulse wave click (or that click) and healed all the way up to top dial with one attack.

That was nice.

LIFE ENERGY DRAIN: Each time an opposing character takes damage from an attack by Nemesis or Nemesis's Poison, Nemesis may heal 1 damage.

You actually have the answer in the power, bolded