- This card's name is a portmanteau of Wight (the Japanese name for "Skull Servant") and nightmare (the black creature behind it is a reference to Mare).
- Fittingly, this card has the same Type, Attribute, Level, ATK and DEF as "Skull Servant".
- This is the second card to have the effect of being treated as "Skull Servant" while in the Graveyard; the first was "The Lady in Wight".
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