Kar'r'rga

Kar'r'rga is a savage god worshipped by the non-enlightened natives of the Al-Sartan archipelago in Zakhara's Crowded Sea - human and non-human alike. Its special servants, also called its children, are the monstrous sartani, that appear just like their god: a giant humanoid with the head of a crab. The lagoon called Batihat al-Saji in the centre of the island group is sacred to Kar'r'rga: Here offerings are put by his followers, while trespassing non-believers are said to be destroyed.

Secret of Kar'r'rga
The truth of the matter is that at the bottom of the lagoon a vortex can open to Pandemonium, where the crab god resides.