Anyone Know Where These Enemies Are?

I need to know the locations of the following enemies:

Wilds Beholder
Rift Nightmare
Ruins of Ascalon Ghost
Rift Ghost
Krytan Nightmare
Crystal Desert Beholder
Ruins of Ascalon Beholder

Something is telling me they are in Underworld (UW) and/or Fissure of Woe (FoW). Does anyone know for sure where these enemies might be? Thanks!

The Rift creatures may be from the Tombs of the Primeval Kings. Never heard of or seen the other ones before.

Their drops do not expert salvage into Ectos, sorry. I've tried with about 1000 of them.

I do have some glittering dust though... about 50000000000000 of them