The Bob-ulk is an enemy creature from the video game Paper Mario: The Thousand-Year Door. It is a large, purple-coloured Bob-omb.
Found in the Pit of 100 Trials, the Bob-ulk is a stronger version of the Bulky Bob-omb. It has a similar move pattern, lighting its fuse, then increasing its defence and attack stats, charging its attack by 9 (whereas the Bulky Bob-omb charges by 3) and then finally blows up, dealing massive damage to the player as well as any other enemies in combat.
Like other Bob-ombs in the game, the Bob-ulk can be detonated prematurely by fire, lightning or explosive attacks. Freezing it will extinguish its fuse and force it to reset its move pattern. Stopping time will also halt attack progression.