Stallord

Twilit Fossil Stallord, or simply Stallord, is the fourth boss in The Legend of Zelda: Twilight Princess and the final boss of Link's Crossbow Training. In its debut appearance, Stallord is fought in the boss room of Arbiter's Grounds, where Link encounters it at a large pit of quicksand.

Stallord is a massive skeletal being with two horns on its head. Stallord appears to only have an upper half of a body. When it is active, Stallord's pupils are glowing pink. Its name appears to be a portmanteau of "Stal" (a prefix used for several skeleton enemies, such as Stalfos) and "lord".

The Legend of Zelda: Twilight Princess
In The Legend of Zelda: Twilight Princess, when Link enters the boss room, he finds the remains of Stallord lying in a large pit of sand. Zant teleports into the room, standing in front of Link, sticks the Scimitar of Twilight into Stallord's skull, and then vanishes. Stallord's pupils start to glow pink, then it gets up, and roars at Link.

The battle starts, and Stallord summons Staltroops out of the quicksand. They surround Stallord and protect him from taking damage. Stallord attempts to spit blasts of dark fire at Link and slam his hands down on him if approached. He must equip the Spinner and ride it along a long, circular rail attached to a platform surrounding a large pit of quicksand. Link must avoid being hit by the Traps that move around the rail. To attack Stallord, Link must jump off the rail with his Spinner and charge into Stallord's vertebrae. Each time Stallord is hit, the lowest vertebra breaks off, causing Stallord to sink lower into the quicksand, and more Traps and Staltroops are summoned. When Stallord is hit three times, it falls over, its eyes stop glowing, and its whole body sinks with the quicksand through the floor at the very bottom of the pit. Stallord's head remains on the floor.

The second phase of the battle starts when Link inserts the Spinner into a slot and rides it. Part of the platform then rises up, revealing it to be a tall, circular column. Stallord's head awakens and levitates in the air, and then it charges at Link, knocking him back down below. Link must take out the Spinner and ride on parallel sets of rails that spiral around the tall column. There are parallel sets of rails on the adjacent wall. After a while, Stallord's head appears hovering in front of the column, and it spits out a large, regular fireball. To avoid the fireball, Link must jump with the Spinner to the adjacent set of rails. Stallord's head follows in front of Link as he moves between rails. Each jump takes Link slightly closer to Stallord's head but also lowers him. If Link jumps too many times, he returns to the floor, and Stallord floats away.

When Stallord's head is next to Link, he must jump at its head to knock it to the ground, before Stallord breathes fire on him. Stallord's head falls to the ground, slightly unconscious. To attack Stallord, Link must slash at the Scimitar of Twilight, which is sticking from its head. Stallord's head gets up, and it continues hovering in the air. Traps start to appear around the rails (first on the inner rail, then on the outer rails), forcing Link to jump from them while approaching Stallord, though they crumble when he reaches it. The process of Link jumping at Stallord's head and then slashing at the Scimitar of Twilight must be repeated two more times to defeat Stallord. When defeated, Stallord's head flies up into the air and then hits the ground and vanishes. Link goes back to the top of the column, where the Scimitar of Twilight descends and breaks open, revealing a Heart Container.

Trivia

 * The music for the second phase of the battle is an arrangement of the dragon boss theme from The Legend of Zelda: Ocarina of Time.