(This card is also always treated as "Legendary Dragon Critias".)
Send 1 Trap Card from your hand or your side of the field to the Graveyard that is listed on a Fusion Monster that can only be Special Summoned with "The Fang of Critias" (if that card is Set, reveal it), then Special Summon that Fusion Monster from your Extra Deck. You can only activate 1 "The Fang of Critias" per turn.