Unique. Spawn. The Pûkel-deeps and The Gem-deeps each have an additional attack: Spawn-3 strikes with 15/8 prowess. In addition, +1 to all body checks for Elves, Dwarves, Hobbits, Dúnedain, and Men resulting from Spider attacks.
"...such as once of old had lived in the Land of the Elves in the West that is now under the sea..."
-LotRIV