Skull Archfiend, known as Daemon's (デーモンの, Dēmon no) in the OCG, is a series of Level/Rank 6 DARKFiendmonsters consisting of "Summoned Skull" and its counterparts of various monster types. The latter support "Summoned Skull" and are also treated as "Summoned Skull" while face-up on the field, except for "Archfiend Commander" and "Archfiend's Arrival". Each member has "Daemon's" in its Japanese name. Their English names have a similar naming convention, except for "Summoned Skull".
All members are inherently part of the "Archfiend" archetype.
Each member is enveloped in lightning of the same color as its respective monster type, although "Summoned Skull" is only enveloped in yellow lightning in its third artwork. The artworks of most members also reference their respective types of Special Summoning.
