The sewer of Grimrock is a foul place, carrying the blood, dirt, and sweat of many past adventurers down into its hellacious depths to feed whatever hides down there. No one has seen it, possibly not even the architects of the prison spire. All that is ever glimpsed are its gigantic tentacles, reaching out between grates and snatching food to pull down into what must be its waiting maw...

There are fierce, twisted creatures in Mount Grimrock that have never seen the light of day. The Tentacles that live in the bowels of the dungeon are one such abomination. Living within the walls and floors, they may not be a common sight, but adventurers would be wise to watch their step when walking near floor grates. The Tentacles are actually part of larger creature simple known as the Unseen Beast that inhabits the deepest pit of Grimrock. No one knows where this beast comes from or how it looks, only that there is a chance that it slimy tentacles, also called the 'Hands of the Unseen Beast', reach up from gratings in the floor when the unexpected prey is passing by. They are immobile and attack only in melee range. Their attack can cause paralysis.

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