Lips for Days

"I'm BAAAAAAAAACK! Octostomp"

- intro to the Octostomp boss fight.

The Octostomp Returns is the third boss mission in Splatoon 2's single-player mode, Octo Canyon.

Walkthrough
You need to climb to the top of it after when the boss faceplants itself. That is where the tentacle is located.

Phase 1
The Octostomp will run up to you and try to face plant itself on you, exactly as it did in The Mighty Octostomp!. You can climb up it once its on the ground, but it won't stay like that forever. The boss can also to a sliding charge attack. After the charge, the Octostomp will do its face plant.

Phase 2
"And I brought this sweet new coat! Neo Octostomp"

- intro to phase two, the Neo Octostomp.

The boss is now covered in armor that makes it un-inkable. To get rid of the armor, you must attack the black buckle holding the armor together. Its located on the Octostomp's face. If the boss still has its armor, it can do a attack where it fires a Splatling at you. He will use all his attack methods from phase 1.

Phase 3
The boss regenerates its armor, and now it has two extra faces. These faces will make the machines sliding charge and face plant much wider. Destroying the armor will also get rid of the faces. He uses all attack methods from the previous phases.

Trivia

 * The Octostomp is the only boss to have two introductions, its second being in Phase 2 where it is renamed the Neo Octostomp.