Debt to the Deathless

Each opponent loses two times X life. You gain life equal to the life lost this way.

"If a man gathers ten thousand suns in his hands...
If a man seeds a hundred thousand worlds with his sons
and daughters, granting them custody of the galaxy itself...
If a man guides a million vessels between the infinite stars with a mere thought... Then I pray you tell me, if you are able, how such a man is anything less than a god?"
— Lorgar Aurelian, Primarch of the Word Bearers