Boss Remains are quest items from The Legend of Zelda: Majora's Mask. They are masks left behind by the bosses who inhabit the four temples of Termina. Each time Link defeats a boss, he is rewarded with the mask it previously wore. The masks have been cursed by Majora's Mask to keep the Four Giants imprisoned within the bodies of the bosses. When Link acquires one, the Giant that had been sealed by it is freed. Link will retain the Boss Remains even after resetting the three-day cycle, and so the Giants remain liberated. After Link collects all four remains, he is able to summon all Four Giants on the night of the Final Day, allowing them to prevent the Moon from crashing into Termina.