What is Grigorius the Grigori??

[lch]

It's some unit which pops up and leaves again on his own whims, for what I know.

Grigorius the Grigori is an ancient being sent to watch the affairs of contending gods. He answers tha call of wishful thinking and will appear and disappear at his own liking.

Wait, "tha call"? That's a typo in the description, just there.

[Beorne]

It appeared to me as the "rightful hand of the dungeon master" ...