Nightmares are a special type of succubi that appears specifically into the collab "The Night Country and the Heroes of the Seven Worlds".
They are succubi-type monsters defined by their abilities to completely resist damages other than pleasure, and can only attack with skills that use the pleasure element. They can still use support abilities just fine.
The first one is faced in chapter 8, and the game insists about their nature and the strategy required to defeat them.
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Est -
Rigeo -
Est/Companion -
Fulbeua/Companion -
Fulbeua -
Nightmare (SQ)/Lilin -
Nightmare (SR)/Mare -
Nightmare (SR)
All items (11)