That spawns at the entrance to Sekrion's Lair if a player stands there to long? It belongs to Vex subset that is not listed in the Grimoire and nor have I ever encountered another Vex belonging to it. The name of this faction is "Aphix Invasive". If an enemy kills you, it will show their faction/subset under their name. The subset is identified be a cluster of spikes on the head of the Minotaur.
*Edit: I honestly didn't think this would garner as much attention as it did. Thanks!
*Edit 2: #7 in Trending! Woot!
*Edit 3: Some Psion Operants belong to a group called the Sky Burners. Credit belongs to VanillaShark.
*Edit 4: Highest Rated! (Minotaur does its fistpump thing)
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The Fanatics belong to the Aphix Invasive too. Other than that, I don't think there is a grimoire card about the Aphix Invasive.