Fraaz

Fraaz is the boss of the Snow Temple in Spirit Tracks. He is an imp-like creature capable of attacking with fire and ice.

Strategy
At the start of the battle, Fraaz will inflate himself and prepare an attack using either fire or ice - in order to defeat him, Link must target him with the Boomerang after igniting it with the opposing element from one of the two torches in the center of the room. After enough damage is dealt, Fraaz splits himself into two separate elemental entities, both of whom Link must attack using the same method, using either the map on the upper screen or their attacks to differentiate between the two.

Defeating the pair causes Fraaz to reform and prompts him to destroy the two torches; from this point forward, Link must repeat the same strategy, only using the elemental attacks of both Fraaz and his separate forms against them. As the battle progresses into its second and third phases, Fraaz will also begin to inflate himself more and more with each attack, requiring that he be struck increasingly more times with the Boomerang in order to fully stun him and render him vulnerable to Link's sword. After sustaining sufficient damage from Link, Fraaz inflates himself one final time and explodes into dust, releasing the temple's Force Gem and restoring its energy flow to the Tower of Spirits.

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.
 * In addition to Blaaz, Fraaz is also similar to Twinrova from Ocarina of Time, in that he can split himself in two and attacks with fire and ice, both of which must be used against him.
 * Fraaz has facial features reminiscent of both Keese and Octoroks; both of these creatures can also be found within the Snow Temple.