Fraaz

Fraaz is a bat-like boss in Spirit Tracks, residing in the Snow Temple. He has a physical appearance that resembles a Miniblin and a head that looks like a Keese. This boss is very similar to the fight against the duo of witch sisters, Twinrova from Ocarina of Time, in the way that he can shoot both fire, and ice, and his weakness will be either cold or heat depending on his physical status. He also will split into two ghostly creatures if Link hits him with the boomerang after passing through ice or fire like Blaaz, his relative from Phantom Hourglass. He likes to inflate like a balloon to intimidate his enemies before a battle.

Strategy
The arena where the spirit is fought is located on the top of the Snow Temple, in the ice and cold, with two torches in the center. As soon as Link enters, both torches ignite- one begins to burn with flame, and the other with ice-cold blue flame. The demonic spirit immediately appears, swelling up like a balloon. Fraaz starts off by swelling up, glowing with a certain kind of element, either fire or ice, and after a few seconds releases a devastating attack of the corresponding element. Link must use the element that opposes the spirit's attack to stun the ghoul and make him stop his attack. After several slashes, Fraaz splits into two small, ghostly, elemental dolls that each have a certain element. The aura that gives them their power is cleverly cloaked, but a hit with the boomerang will briefly show the elemental alignment of one doll. The dolls polarity can also be seen on the top screen (it was probably meant for the player to use the top screen, as the top screen is used in all the other DS boss fights). The dolls can charge up a low-power attack if Link leaves them long enough, but these are easy to avoid. After viewing an elemental aura, the dolls will hurriedly swap, hoping to make Link lose the position of the vulnerable one. A boomerang laden with element will destroy a doll, and once both of them die Fraaz reforms, shaken up. He will become enraged, and destroy the two torches, forcing Link to use his boomerang on the monster's attacks to defeat him. Two doll-killing rounds later, the fiend swells up, freezes as a victory theme is played, and collapses into black smoke, giving up the Force Gem of the Snow Temple.

Trivia

 * Fraaz's name is derived from the word "freeze," as well as "Blaaz," his predecessor from Phantom Hourglass whose name is a pun on the word "blaze." As such, his name is derived from the words "freeze" and "blaze," aptly fitting considering his ability to freeze and burn.