Rollout

Rollout is the third Mega Orelan, as King Gold calls them. It's a giant Oreling/Oretank that is stuck in its boulder form.

Biography
Rollout is an unexplainably giant Oreling/Oretank that is trapped in its boulder form. It has multiple cracks on its body and has a "face", which was sculpted by Orelings and Rockroughs.

Rollout is seen near the end of the level Rocky Doom. You need to bust open a wall to enter a room that is completely flat. Rollout drops from a hole in the middle of the ceiling and the battle starts.

Strategy
To defeat Rollout, you need to make Rollout fall into the lava that appears when it drops from the ceiling. As Rollout constantly rolls around the walls of the arena, a task like that is easier said than done. Getting close to Rollout causes him to gain a burst of speed and roll at you. You need him to fall into the lava three times.

While all of this happens, Oreslugs support Rollout by coming through the pool of lava. They will attack you if they get close, so it's best not to dispose of the Oreslugs, which infinitely spawn after the second time Rollout falls into the lava. Defeating Rollout gives you an unknown key. This key unlocks a safe in Inkopolis.

Attacks

 * Rollout! - Rollout speeds into you. This is a guaranteed insta-kill for Inklings.

Trivia

 * Fans often call Rollout the most annoying boss because of how Rollout ignores you half the time, along with the infinitely spawning Oreslugs and how Rollout insta-kills you.
 * Rocky and Stoneson's famous line is "ROLLOUT!". This may be a nod to Rollout.