RTF is a global modification that replaces all towns in the game.

As far as I remember, Faceless are spirits (or something like that), but definitely not elementals. Because then, essentially, a troglodyte would be an analogue of an earth elemental. (nonsense)

But I don't remember anything about the auras. :(

Faceless is one of the six original races.

Auras are light elementals sent by Elrath to serve humans.

A troglodyte is a lesser spirit (like a kappa). I think that when they become stone pillars in dungeons and someone accidentally breaks them, they can turn into a tier 5 earth elemental.