Mystical: The Titan Heart

Sal had left his past behind.
He had annihilated an entire planet to keep the rest of the system safe.
Doing so left him weak, physically and emotionally. Now he chooses to spend his days with bottles and whisky glasses as he rots away along with the heroic identity he once had.
However, when a man, wielding the same powers as he does, starts to traverse the stars, killing every one he'd ever worked with, he's forced to take up arms and to deal with the vicious murderer.