DOOM (2016) --> Waking up from sarcophagus? (Yeah, i need to play again with the game, and read the lore/texts/codex)
You should, that stuff is pretty interesting. Lays foundation for linking all Doom games together into single continuity etc.
Demons separated Doom Slayer from his armor after events of Doom 64, locking them into separate sarcophagus's in order to stop his reign of slaughter over demons etc.