Going to say that Asmodeus, Beelzebub, and Paimon are away on vacation somewhere.
Malphas will absolutely love that it's night time all the time, but will not like the monsters that are about. Chances are he'll be in crow form as often as he can be.
Fenrir will use his strength against the monsters, and will be in wolf form as much as possible.
Flauros, surprisingly might not like this, but hey, he's got fire on his side. And suddenly I just pictured people crowding around him, and his fire.
Amdusias will have not pleasant music playing, and will probably be running from everything.
Enyo will think this is awesome, especially when the chaos and discord start happening! But then she'll be disappointed that the monsters don't bleed.
Andraste will...probably not be in a good place, but hey, at least she's got fighting skill?