Description from original post (created 2016-01-31 17:04):
The past Vex.
Hobgoblin:
Minotaur:
Primeval Mind:
Those who delve deep into the Vault of Glass have seen time itself torn
asunder. Awestruck Ghosts report encounters with ancient Vex, their
casings built long before the age of humanity.
It would be easy to assume these Vex are the ancestors of those we face today - but with the Vex it is never so simple.
Source:http://db.destinytracker.com/grimoire/enemies/vex