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The Underworld has some of the hardest level monsters in FusionFall. The average monster level is 61. There is only one NPC here and it is Grim. Grim is the player's only way in and out of the monster world. There are no Fusion monsters or Fusions here, just tons of undead monsters, ranging from skeletons to three-headed skeleton dragons.
The storyline of this monster place is that the Underworld is having a Civil War and the entire place is in chaos. Grim and the Hero are sent to this place to destroy every monster. After players are done, they must attack the Kingdom of The Undead and defeat Hades..