Ultimate Sacrifice

Ultimate Sacrifice is an achievement featured in the map Destati. It requires the player to "seal the rift". It is the main easter egg of the map. It can be achieved in solo or with multiple people.

Step 1: Opening the Generator Room
To the east of the Morbid Pillar is a locked door. In order to open it, one must acquire a M79 "Thumper" and shoot at the door, causing it to burst open. Inside the room is the Summoning Key, which was teleported there when the characters entered the rift in the previous level. Pick up the Summoning Key and bring it to the Morbid Pillar.