Magman

Magman (Yogan in Japan) is a boss in Kirby 64: The Crystal Shards. He is fought inside Neo Star's active volcano. He is a large being made entirely out of magma, and is able to manipulate the burning-hot magma that he dwells in. As well as attacking Kirby with magma, Magman is also capable of summoning fleets of fire-based enemies that will attack Kirby for him. He is notable for being one of the few bosses with two phases fought in the same arena, as well as spending the majority of the fight in the background and not directly fighting Kirby. His affiliation with Dark Matter is never revealed, either. It is not known if was directly created by him such as Pix was, or if he was simply possessed during the fight like the previous bosses Acro or Adeleine.

Kirby 64: The Crystal Shards
As Kirby delves deeper into Neo Star's largest volcano, he reaches a volcanic crater. Magman arises from the lava and the fight begins. In the first phase, Kirby is confined to four small platforms while Magman stays in the background and out of Kirby's reach, similar to Fatty Whale. Many Magoo arise from the lava at some parts during the battle, which can be inhaled and later used as ammo. Magman attacks by using the lava inside the arena to form pillars of lava which lift up the platforms and plow into Kirby. Attacking these pillars is the only way to damage Magman for the time being. After being damaged enough, Magman charges after Kirby until they reach a large platform of solid lava. In this phase, Magman fights Kirby himself, and as such, Kirby is able to damage him up close by hitting him in the face. Occasionally, Magman will turn into a pool of liquid lava and charge at Kirby, summoning three Burnis to battle right after. In addition to this, and spewing out a large beacon of fire, Magman is able to cause rocks to fall from the ceiling. After being defeated in this phase, Magman withers and cools into the solid rock of the arena, leaving Kirby with another Crystal Shard.