The Boss Kettle for this mission can be found in the back of the Beaker's Lookout. To reach it, use a Grapellink in the back of the area to get to a Ride Rail. The ride rail will loop around the platform with the Kettle. Hit either of 2 Grapellinks to reach the kettle.
Gameplay
Boss Appearance
The Octostomp has not changed that much since the last game, however it does have some new tricks up its sleeves. The Octostomp will slide at the player before "stomping" and does not lose panels unlike the battle in Splatoon. During the 2nd phase, the Octostomp will wear a coat made of ink-proof material, much like the inside of a Hot/Cold shopping bag. The coat has a design of a penguin on the back, and holding it onto the boss is a large plastic buckle, which the player will need to shoot first before they can climb up. The Octostomp also is hiding an Octotrooper inside the top of the coat, complete with a Splatling gun. During the 3rd phase of the fight, the Octostomp gains another coat similar to the first one, but this one has two zippers at the sides, allowing its 2 extra faces to be revealed. At the back of the boss is the hole where the tentacle is resting, which the player will need to shoot in order to defeat the boss.
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 without its coat.
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
The Neo Octostomp.
“
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. It will use all of its attack methods from phase 1.
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. It uses all attack methods from the previous phases.
