Bronze Wraith

In Pikmin Eco II
The Bronze Wraith is a gelatinous, metallic being found in Pikmin Eco II as the final boss of the main game. While first fought in the Formidable Oak, it is fought again after it crashes Acorn's ship onto the Lone Island.

Much like the Oozore, the Bronze Wraith's body is made up of a liquified metallic substance, bronze in this case, with a small golden orb serving as the core of its body, floating inside a ring. It also has four root-like appendages for locomotion and a small stem as its main body.

Strategy
Unlike other bosses in Pikmin Eco II, the Bronze Wraith has two notable boss fights: one takes place within the Formidable Oak, and another on the Lone Island at the end of the game.

Formidable Oak
The Bronze Wraith's attacks, elemental in nature, against leaders and Pikmin originate from the creature's core. Amongst these attacks are a fireball that is launched towards its prey and creates a small patch of short-lasting flames upon impact with a surface, a water bomb that bursts into a small wave on impact, and a bolt of electricity that kills all but Yellow Pikmin it contacts. Prior to the Bronze Wraith executing the last attack mentioned, a ring will be visible on the ground, indicating where the bolt will strike. The core's color changes color to match that representing the hazard it is about to use, which also makes that Pikmin type the only one capable of latching onto the core and attacking it. Throwing the wrong type will make them bounce off harmlessly.

Lone Island
The final fight against the Bronze Wraith is generally the same as the one held in Formidable Oak, as it consists of similar attacks with similar strategies. However, it gains a few more elemental abilities to use: a cloud of spore-like particles that suffocate any type of Pikmin within its range, an aura wave that immediately buries affected Pikmin into the ground, and a ring of sound that shoves Pikmin into the coastal waters of the island. The method of attacking the Bronze Wraith is still the same, but only when it uses elemental attacks.