Skull Island

This island is dominated by a massive fortress that runs nearly to the edge of the landmass, surrounded by 20-foot high stone walls manned at all hours by agents of the Xanathar. Atop these walls are ballistas, as well as cannons which shoot alchemist’s fire, which keep the island safe from invaders.
The massive subterranean lake in which Skull Island sits is called the Skull Pool, and is the first part of Skullport most people see. The ceiling of the cavern is dome-shaped and 160 feet high at its peak. A massive, hollowed-out column rises from Skull Island all the way to the ceiling.

Location under

Skullport