I Owe the Whole Universe, and I Can Only Repay It with Invincibility

I owe the whole universe, and I can only rely on invincibility to repay the debt. To sum it up in one sentence: After time travel, I was bound to the causal creditor system, and found that I was the ultimate villain in the world, owing countless blood feuds and huge karma. In order to avoid being eaten alive by my creditors, I can only "try" to become invincible so that they... Line up to kill me. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.