Added after 20 hours and 12 minutes
For now, the candidates for transferring to the real list of changes are:
3 = Adepts, Seraphs
2 = Ghost Dragons, Crystal Dragons, Red Dragons, Cerberuses, Wyverns (without regeneration), Goblins
1 = Skeletons, Banshees, Minotaurs, Hydras (without regeneration), Griffins, Cyclops, Golems, Titans
Controversial:
Liches, Bears, Jarls, Imps, Pits
Negative:
Druids
Based on the changes already made, it's possible that Nightmares are still not balanced. There are 3 options:
1) Leave Nightmares as they are (aura of 7)
2) Weaken the alternate form Nightmares again (aura to 5, or damage to 8-16, like the regular form)
3) Strengthen the regular form Nightmares (damage like the alternate form, 10-17)