Long Water Dumple

The Long Water Dumple resembles a Water Dumple, but much larger and longer and with a distinct fin at the back, making it resemble an eel.

The boss starts its assault by swimming away from leaders and their Pikmin before it swims up to them. Eventually, it decides to lunge forward in an attempt to eat Pikmin or a leader. When the lunge is dodged and the creature swims past the group, it can be damaged, and if Pikmin are latching on to it, it will continue taking damage. The Long Water Dumple will eventually spin and knock off all Pikmin latched onto it. If it hasn't taken enough damage to advance to the next phase, it will repeat the process.

When its health reaches two-thirds, it will swim away to violently scrape against a wall midway through returning, causing boulders to fall from the cave ceiling. A Pikmin touches one won't die, but it will be knocked away and become temporarily stunned. Leaders that touch them will take damage and be knocked back, but the boulder still won't break upon impact with them. After the boulders cease falling, the Long Water Dumple will return to the leaders and their Pikmin and enter the standard cycle, except there's an extra attack between the lock-on and the lunge: it will spit out two volleys of two rocks each, with one rock angled a bit up and the other a bit down. These rocks have the exact same effects as the boulders.

When its health drops to the last third, the Long Water Dumple will once again swim away, rub against the wall, and cause boulders to fall down. This phase is identical to the previous one, except it spits three rocks inside of two, with the extra one going straight forward, and every lunge causes some more boulders to appear.