Eemmaat is an Aboleth, brother of Golorr and son of Queen Oothoon.

The party briefly ran into them en route to Chult and will meet again in in ToA “Tomb of the Nine Gods” level 5 (Gears of Hate) on p174 (ToA refers to him as G'lyh'rul) as he is searching through subterranean waterways in his quest for Golorr

Eemmaat is responsible for the abduction of dwarves from Hrakhamar. He takes them to Withers in the Tomb of Annihilation.