Boss Remains

In The Legend of Zelda: Majora's Mask the Boss remains represent slain bosses that inhabit (or infect) the four Temples of Termina. When link defeats each boss, he is rewarded with a mask that resembles the head of the fallen enemy. These remains symbolize the release of the Giant held at bay by each of the bosses. When Link collects all foru remains, he is able to summon the Four Giants to stop the Moon form crashing into Termina.

Odolwa's Remains
A mask that Link recieves after defeating the Masked Jungle Warrior Odolwa who restrained the Giant of the Southern Swamp, who guarded the Woodfall Temple.

Goht's Remains
A mask collected by Link after defeating the Masked Mechanical Monster Goht which restrained the Giant of Snowhead Mountain, who guarded Snowhead Temple.

Gyorg's Remains
A mask Link obtained by defeating the Gargantuan Masked Fish Gyorg who was restraining the Giant of Great Bay, who guarded the Great Bay Temple.

Twinmold's Remains
A mask retieved by Link from defeating the Giant Masked Insect Twinmold who restrained the Giant of Stone Tower (canyon), who guarded the Stone Tower Temple.