The Plasm Wraith (アメニュウドウ?, lit.: "Rain Monk") is the final boss in Pikmin 3, and is responsible for capturing Captain Olimar. It is a virtually featureless, vaguely-humanoid Waterwraith-like being made entirely out of a cellular protoplasmic mass, which allows it to split different parts of its body off to create other semi-independent entities, or even change shapes.
The Plasm Wraith is encountered at the Formidable Oak, having taken Olimar captive with what appears to be curiosity rather than maliciousness. Efforts to rescue Olimar cause the being to become the Mysterious Life Form and slowly ooze towards the captain, attempting to retake him, until it reaches the outside of the oak. Once this occurs the Plasm Wraith takes its golden humanoid form, locks Olimar in its core, and begins to attack, starting the final boss fight. Defeating the Plasm Wraith immediately activates the game's ending.
As with all final bosses thus far, the path leading up to it, and/or the boss fight itself, requires the knowledge and use of every single Pikmin type.
When Olimar first arrived at the Formidable Oak, he saw a gold, shiny substance at the top of the tower, and decided to investigate. Louie expressed discomfort and chose to stay behind, letting Olimar go on ahead without him.
At first, the creature was curious and playful towards Olimar and did no harm to him. However, when Olimar tried to leave, the creature became aggressive, triggering his suit's auto-sleep function and dragging him back to its cave. It became protective of Olimar to the point that it would attack anything that showed interest in him. The exact reason for this bizarre behavior remains unknown.
Pikmin 3 Prima Guide
“The Plasm Wraith is located in the Formidable Oak. This resilient creature uses spiked appendages to skewer its victims, and is capable of summoning hazardous Elemental Plasms. All Pikmin types are useful against this enemy, so assemble a well-balanced squad before you enter this battle.
When you encounter the Plasm Wraith, use Rock Pikmin to attack the creature from a distance. When the Plasm Wraith begins to fall apart, destroy the puddles of loose plasm before the creature is able to reclaim them.
Rock Pikmin are immune to the Plasm Wraith's direct attacks, so they're your best option for the bulk of the encounter. Once the creature begins summoning Elemental Plasms, however, use the corresponding Pikmin to destroy each hazard. Use Winged Pikmin to attack the Plasm Wraith each time it flies into the air.Attack the Plasm Wraith to weaken the creature, then destroy the loose plasm to prevent the creature from regaining its strength.”
The Plasm Wraith is also the final opponent in Defeat Bosses!. Players are given 12 minutes to take it out. The path that leads to where the Onion is in story mode is blocked off by a "keep out" sign. The cave exit is not blocked off, but it cannot be entered at all, unless glitches are used. There are 20 of each Pikmin type, 10 of each type in the ground to be plucked, 10 of each type already in the squad.
The following table lists what medal the player gets according to the time they take:
These are the world records for the challenge, as obtained from the in-game global rankings feature. The following scores were retrieved on December 9th, 2015.
When the Mysterious Life Form transforms into the Plasm Wraith and recaptures Olimar, proceed to throw Pikmin at its stomach. This will cause small bits of its plasmic exterior to fall off, making its health go down. However, Pikmin must then attack the puddles of plasm on the floor to destroy them, or the Wraith will simply reabsorb the puddles and regenerate health. Although it is not necessary, you may take 20 of each Pikmin for the battle. Send the other two leaders out of its reach, as this fight only requires one leader.
Be prepared to lose a lot of Pikmin during this phase of the battle. It will actively attack Pikmin, but mainly prefers to target the leaders and attack when they are close, by skewering them with a rapid "needle-arm" attack. If any Pikmin aside from Rock Pikmin are in range of this attack, they will be skewered and eaten. You can use one leader as a distraction, and have another handle all the Pikmin, but this may be difficult to manage. While it is doing this attack, it is unwise to attack it head-on, as it will not be fazed by attacks, and can easily kill the Pikmin. Instead, throw just a few Pikmin at it, preferably its backside, until it tries to shake Pikmin off by twisting its body. This will cause additional plasm to fly off of its body. As it loses more and more plasm, it decreases in size; this is the key to winning the fight.
It can also become temporarily airborne, during which it can be reached by Winged Pikmin, or, with some effort, Yellow Pikmin. If it is hit with enough Pikmin while flying, it will fall down, losing even more plasm as it hits the ground.
After a quarter of its health is depleted, the boss will attack by spewing large masses of plasm onto the arena, then spitting out a small, golden patterned cube. The plasmic mass will form around this solid cube and transform into an Elemental Plasm. Each Elemental Plasm has a specific hazard associated with it. If the Wraith spits out a cube, quickly call all Pikmin away from it. The less plasm in the Elemental Plasm, the less time is needed to destroy it. It has many forms, each of which can only be destroyed with certain Pikmin types:
Destroying Elemental Plasms will leave behind a large amount of plasm that must also be destroyed. If they are left there for longer than 20 seconds after being initially spat out, the Plasm Wraith will reabsorb them to heal itself. After the boss has been reduced to just a quarter of its health, it will create three Elemental Plasms at once.
Despite this being a very difficult boss, it is possible to beat it without any Pikmin lost. To make things simpler, use one leader at a time, but be sure to switch leaders when the current one's suit is very damaged. Bring out as many Rock Pikmin as you have, preferably flowered. This method can make the battle take two days, but one is possible. For the first phase, simply pummel it and the plasm that falls off. Once a quarter of plasm is lost, the battle gets more difficult as it shoots Elemental Plasms. The list below shows what to do for each one:
After its health is lowered enough, it will have been beaten. Try to keep the Rock Pikmin in your group and organized, as having Pikmin all over the arena will possibly make some perish. Whistle any that get knocked to the ground, that are burning, suffocating or paralyzed. After the cutscene ends, you will have completed the fight without deaths.
If a large group of Pikmin is too difficult to keep track of, another option would be to bring around 40 Rock Pikmin instead. This should reduce the risk of casualties from any Elemental Plasm. A smaller group is a bit more manageable, but will not be quite as powerful as a full group, and thus may make the battle take slightly longer. This strategy should help reduce the amount of Rock Pikmin that are idle or affected by a hazard, as a smaller squad of Pikmin has less of a risk of being hit. Otherwise, it is recommended to follow the "No deaths" instructions above along with the "Smaller squad" strategy if you are attempting a zero death challenge.
"Plasm" means "living substance" while "Wraith" means "spirit" (such as a ghost). The creature's Japanese name is アメニュウドウ?, in which ニュウドウ? translates to "Monk", but アメ? can either mean "rain" or "candy" (particularly, toffee). Both could refer to the creature's appearance, either during its humanoid phase or its watery phase. It can also be noted that it always rains during the Plasm Wraith's boss battle (provided that no exploits are used). アメ? can also be short for "amoeba" (written in katakana like "ameba"), a unicellular organism usually found in water. Finally, its name could also be an allusion to Wanyūdō, the guardian of the gates of Hell in Japanese mythology.
Names in other languages
In Super Smash Bros. for Wii U
The Plasm Wraith appears in Super Smash Bros. for Wii U as a collectible trophy and as a Smash Tour trophy. When used in Smash Tour before a battle, it heals the player every time they shield an attack.