Merrshaulk

ripvanwormer's picture

Merrshaulk is a yuan-ti deity on the decline, spending long periods of time in deep slumber. His realm is Smaragd, the 74th layer of the Abyss, which he shares with Ramenos. On Toril it is worshipped under the name of its aspect, Sseth.

Sources: 
Monster Mythology
On Hallowed Ground
Complete Divine
Defenders of the Faith
Serpent Kingdoms
Planescape, Dungeons & Dragons, their logos, Wizards of the Coast, and the Wizards of the Coast logo are ©2008, Wizards of the Coast, a subsidiary of Hasbro Inc. and used with permission.