Cavern Coral

Cavern Coral is a type of predatory acquatic fungus that grows, coral-like, in subterranean ponds and pools. As much like a sea anenome as true coral, the creature wraps its swaying tendrils around prey, pulling it beneath the water and keeping it there until it drowns. The tendrils then pull the corpse in to provide food to the main fungal mass. Though uncommon in deep subterranean pools, cavern coral thrives in shallow subterranean streams, ponds, and lakes. Its tube-like tendrils spread out from a central hub, and wave gently in the current.

Source

 * Warhammer Fantasy RPG 2nd ED -- Children of the Horned Rat
 * pg. 112

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