The Toilet of Doom is Hat Kid's stray soul possessing a toilet and a boss in the Subcon Forest. It acts very hostile, and tries to attack when Hat Kid walks near it. It serves as the titular main antagonist of the eponymous Toilet of Doom act.
The Boss Fight itself has 3 phases:
In the first phase, the Toilet will teleport around the arena, eventually stopping to release several toxic bouncing bubbles. One of which will contain a fruit bomb which must be picked up and thrown to deal damage. After being hit, it will jump in the air and create 2-3 shockwaves on the ground before jumping to the center and causing several of the surrounding cages to sweep across the arena randomly. During this phase, the Toilet will glow blue and can be hit by swinging into it using the grapple point above it.
After being hit 4 times, the Toilet will then jump to the center and release several bubbles that surround and float around the pool, one of which contains a fruit bomb. Hat Kid must use the grapple point to swing and grab the Fruit bomb while avoiding any toxic bubbles among the others. While this is happening, the Toilet will create singular shockwaves every few seconds, leaving it open to attack.
After being hit 2 times. The final phase begins, in which the Toilet will jump to the center and summon 3 cages containing spirits, which it will use to supercharge a fruit bomb to a massive size. If it is allowed to detonate, Hat kid will be defeated instantly and will have to restart the battle. To damage it, Hat kid will need to jump across the 3 cages to reach the top of the bomb where the Toilet resides, hitting it will immediately stop the bomb. It’s will theN jump in the air towards Hat Kid and create 3-4 shockwaves until it is stunned, allowing Hat kid to attack it. It’s last attack is to teleport away from Hat kid and cause more cages to sweep across the arena while turning blue, leaving it vulnerable to damage. The Toilet will repeat these attacks until it is hit 5 times, after which it will explode and be defeated.