The same Mind flayer the adventurer’s encountered outside the road to Amn. Why did he not kill you all? What are his motives? The kobolds that tried to help Daval confessed to serving a greater power that was not the drow. Perhaps him? You know at least that he is a wizard. He displayed amazing arcane skills. He teleported at will, created invisible walls, turned his skin to stone. His spellbook was thick and golden. His mastery of the arcane is undeniable.
Daval and his companions serve Gathanos. Gathanos has also helped House Barneng’to in their struggle in Menzobarranzen. What sort of reciprocate pact has this house made with the Illithid? or are they all under the control of this Illithid.