so our MC is an immortal guy, he was a templar I believe and for some reason got immortality, so after that he was REALLY tortured and experimented on for a long time, he wakes up at a bunker(?) and I remember there was a character that used a Skin mask, I think it was human skin, and he(She? pretty sure it was She) was someone as old as our MC( i think, can't really be sure)