Reaper's body was magically forced into non-existent and his soul into a nightmare realm(seen in chapter 1). His body turned into a cave painting. The Altar was caused made by his sister who had to do it. Its purpose? You'll see.... But he will be free, as I teased lol. Oh someone will replace his spot.(and someone will cry so hard that her Chaos powers will go crazy at Aether freeing and her mom being trapped.) Stinger, things will go crazy here.
art, lore, Reaper be me TTFC be @Stingerthehivewing1