The Possessor is a Pureblood Heartless that is found in Kingdom Hearts II and Kingdom Hearts 358/2 Days. It is one of the bosses at Beast's Castle in the former game, and they are common enemies in the latter game.
The Possessor is quite weak on its own, but is able to animate the various statues and sculptures around the castle. In this manner, it can become the Thresholder, as well as a Gargoyle Knight or Warrior.
Kingdom Hearts 358/2 Days
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Kingdom Hearts II
The Possessor possessed the Dungeon doors in the Undercroft, transforming them into the Thresholder in order to fight Sora. After being forced out of the doors, it floats about helplessly before returning to them, reanimating Thresholder. Though it summoned many Hook Bats, Gargoyle Knights, and Gargoyle Warriors to assist it, Sora, Donald, and Goofy were able to vanquish the Possessor, returning the Thresholder into a normal door as the Possessor faded into darkness.
Other Possessors animate the Gargoyle Knight and Gargoyle Warrior Heartless and appear when they are destroyed, but disappear without attacking Sora. The Dark Thorn can summon Possessors to throw at Sora, but these disappear as soon as they are thrown.
The Possessor is a simple, gaseous creature that bears some resemblance to the Darkball Heartless, sporting a similar, jagged mouth—albeit the Possessor's is red—and glowing, yellow eyes. It is seemingly made up of black, dark blue, and purple shadows.
The Thresholder is made up of two ornate statues carved into a grey, hexagonal doorway. Each statue has one arm "trapped" in the door, though their claws are seemingly grasping the gold lock in the center of the door from the other side. Each statue on the Thresholder takes the form of a muscular, black-skinned demon with a thin, jagged mouth, spherical head, and beady, glowing yellow eyes, similar to a typical Heartless. Its chest, exposed arm, and each of its short, pyramidal horns sport a jagged, yellow pattern decorating them. Each wears a green collar with four short, silver spikes on it, and their hands end in three red claws. Their backs are lined by short spikes, and their lower bodies are actually curled, interweaving tails with yellow tips. Their lower and upper bodies are divided by a thick, sky blue "belt".
In Kingdom Hearts II Final Mix, their appearance drastically changed, the Thresholder statues have lilac bodies, while their horns, head, arms, belts, and chests are dark indigo. Their claws are yellow and their collars are now violet. The door is now black and the lock is cyan.
The Possessor's name clearly refers to its ability to take control of inanimate objects. The Thresholder's name comes from the word "threshold", which has a variety of meanings, one of which is "an entrance", referring to the Thresholder's true nature as a door. Its Japanese name, Gate Guardian, holds a similar meaning. "Gate" can be taken to mean "door" and "guardian" literally means "one who guards", and the Thresholder "guards" the way to the dungeon.
Kingdom Hearts 358/2 Days
As long as a Possessor is touching Roxas, his health will be continuously depleted. Jumping or performing Dodge Roll will help escape its capture. Its 'attack' is nil-based, so having Nothing to Fear equipped will prevent Roxas from taking damage.
Kingdom Hearts II
Upon first entering the Undercroft, the area is filled with Gargoyle Knights. After they are defeated, move towards the Thresholder. Hook Bats will arrive to defend it. After defeating a second wave of Hook Bats Sora is clear to attack Thresholder. If possible use the Hook Bats Reaction Command "Bat Cry" close to the Thresholder to deal damage. The Thresholder will attack by extending its arms across the room and summoning orbs of darkness, so try to avoid those. When its health depletes to a certain point, the Reaction Command "Release" can be used to expel the Possessor from the door. The Possessor has no form of attack or defense, so simply attack it.
Eventually it will float back to the door and reanimate it. Thresholder then begin shooting projectiles at the party. Move in close to attack without being hit. After its health is depleted again, Possessor comes out and floats around again. Eventually, Thresholder will extend its arms at full length, cross them over, and continuously slap Sora. Both bosses must be defeated to end this battle. If Sora is defeated in this fight, the King can become temporarily playable.
Notes and references