"Vassal" (帝家臣（ていかしん）, Teikashin) is a series of monsters with 800 ATK & 1000 DEF related to the "Monarchs", with each of its members possessing an Attribute reflective of the element they control. All "Vassal" monsters have an effect that allows them to be Special Summoned from the hand, but, with the exception of "Escher the Frost Vassal", at the additional cost of disabling the Player who summoned them to Special Summon from the Extra Deck for the rest of the turn.