Spoiler alert: The following section contains plot-specific details.(Skip Section)
Even the stoic Meta Knight has fallen prey to the enemy's evil influence, and now their foreboding fortress has suddenly appeared. Why have they come to this land? WHY?! Undeterred, Kirby and his friends charge forward with gusto.”
Jambastion is a giant fortress that has landed on Planet Popstar. The player fights Pon & Con and The Three Mage-Sisters in this level, and appears to be a warship of Hyness. It is unknown how he acquired the Jambastion, or the abilities it has other than space travel. It is shown to be quite fragile, as after Zan Partizanne is defeated she only punctures the reactor core in the background and the Jambastion is destroyed.
The main body of the Jambastion appears to come from an asteroid of some sort, as it appears to be made of an asymmetric rock. The Jambastion's design features four long off-white horns, bat-like wings and that may have been made in the likeness of Void Termina's third phase, and five red octohedrons that surround the palace's metal rings. On top of these rings are blue runes that appear to made of energy. Under the horns is a giant red eyeball symbol.
In the room with the BombCopy Essence, defeat the Dekabu to reveal a round-trip door. After entering the round-trip door, use Plasma to get Zap Bomb and Bomb Bowl a Zap Bomb under the wire. The explosion will create a lightning bolt which will power the wire to open the gate in the ceiling.
Use the Geokinesis Friend Ability to destroy the Durable Blocks by guiding the stone through the spikes. The stone will slide down the slope after landing and pound an Electric Stake, opening a gate to a round-trip door.
In the second vertical segment, hit the Bomb Block on the right and enter the round-trip door. Obtain Artist from Vividria and paint the blank sign to create a key. Bring the key to a locked door near the end of the room, releasing a round-trip door. After entering the round-trip door, bring another key to another locked door.
Jambastion is a portmanteau from the word "bastion," defined as a "projecting part of a fortification built at an angle to the line of a wall, so as to allow defensive fire in several directions," referencing the location being a fortress, with "Jamba," referencing the Jamba Heart.
A dark and foreboding fortress----who could live in such a place?”
Sectors A, B, and C are references to the Celestial stem. In Japanese, Sector A starts with こう (甲), the first Celestial stem; Sector B starts with おつ (乙), the second Celestial stem; Sector C starts with へい (丙), the third Celestial stem.
Multiple Jambastion Fortresses can be seen floating around Jambandra Base in the 3D hubworld of Far-Flung - Starlight Heroes.
This is the only level where 3D Warp Stars are present, being on the overworld map. They are absent everywhere else.
This is also the only level to contain a Friend Train in Story Mode, being in Sector B.
The beginning of Jambastion’s overworld map theme is a remix of the main leitmotif of Friendly Field.
As of version 4.0.0, Shadow Kirby can occasionally be seen riding a Warp Star across the skies near Heavenly Hall in Jambastion’s overworld map.