The Twinhead Wyvern is a monster from Final Fantasy Mystic Quest, and the reincarnation of Dualhead Hydra. It guards the fifth floor of Doom Castle in a room modeled after Lava Dome's inner chambers. With attacks as powerful as Iflyte and Stheno, it can make the battle difficult, though these attacks can be cured easily.
wyvern is a medieval European mythological winged creature with a dragon's head, reptilian body, two legs (sometimes none), and a barbed tail. They appear in many crests of Europe's ancient families, symbolizing strength. The word wyvern comes from wivere, which means serpent.A
In Germany, the boss is called "Siamdrache" meaning "Siamese Dragon". This is not in reference to hailing from Siam, but rather by being conjoined (or Siamese) twins.