Entity

In Strife, Entities are mysterious creatures from outer space. They resemble Spectres, but they are larger and green. There are 5 Entities, each uses one power of Sigil. Entities are found in the last map - the UFO. After player enters the last room, a green thing in the middle of the room will start spawning Entities after a while. After all 5 are dead, the game ends and you win. If the player is killed by Entities, he can see a cinematic where he sees the doom of Earth.