Encephalithid

the Encephalithid was the Elder brain of Oryndoll in 1370 DR.

Personality
the Encephalithid not ruled the community with absolute authority, it however lead the Elder Concord and had an active role in the govern of the community. It's Psionic Powers were an a level unmatched by any other non-divine beings in the Realms

History
The Encephalithid was the first elder brain grower on Toril by the Mind flayers arrived from Glyth and ruled the first illithid settlement on the Realms, Oryndoll. It lived for millennia. After the Duergars slave revolt the city was in disarray and only the Avatar of Ilsensine, believed by all called by the Encephalithid, saved the situation. During the Time of Troubles Ilsensine manifested using as avatar the Encephalithid and after that occasion the Encephalithid has retained the pair of tentacles commonly associated to the avatar form of the Tentacled Lord.