Kholdstare

Kholdstare (シュアイズ, Shuaizu) is the boss of the Ice Palace, the fifth dungeon of the Dark World in A Link to the Past. It's an organic entity encased into a big formation of ice for its protection.

Strategy
Link must be careful while battling the creature, due to the low friction of the floor. The young hero can use either the Fire Rod or Bombos Medallion to break him out, at which point he splits into three identical parts that can be hit with the Fire Rod or with the Sword. Occasionally, ice chunks will fall down from the ceiling, breaking up into multiple pieces and dropping magic power when the Magic Bar is empty. They can damage Link if they hit him. Upon defeating Kholdstare, Link receives another Heart Container and the Crystal containing the fifth imprisoned maiden.

Trivia

 * Frostare, from Four Swords Adventures, bears a striking resemblance to Kholdstare (in its original frozen form), both in name and physical appearance.
 * Kholdstare may be derived from the words "cold" and "stare" due to its relation to ice and its only eye