From the Super Mario Wiki
Pyrospheres are enemies found in Super Mario RPG: Legend of the Seven Stars. They are located in Barrel Volcano, as well as Bowser's Keep. Pyrospheres usually appear with stronger creatures in battle, such as Chained Kongs or Corkpedites.
When Mario and his allies reach the volcano's main chamber, a large group of Pyrospheres are flying around. Spotting the group, the swarm quickly condenses, forming the Czar Dragon.
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