Towers of the Teeth
The Mountain of Fire#25 (x2/x1)
Location
X (8)
Plains.  
Immune to player card effects.

X is the number of characters controlled by the player with the most characters.

While Towers of the Teeth is the active location, players cannot play allies.

...now near loomed the great rampart of Cirith Gorgor, and the Black Gate amidmost, and the Two Towers of the Teeth tall and dark upon either side.
-The Return of the King