User blog comment:FairyRaven/Fairy Tail Chapter 348: Return of the Demon, Review and Commentary/@comment-7418318-20130824142950

That demon guy said they were at the entrance to the underworld.

Could it be that whoever froze the place over did it close off this entrance to the underworld and Succubus Eye is also trying to undo this spell to reopen this now blocked entrance?

If that's the case, this Dryad might have been the one who cast the spell, but he/she/it did it for good reasons.