"These spell-casting monsters can be found all over Hyrule. They use their fire rods to hurl fireballs or to summon flaming monsters and have been known to severely raise the temperature around them. The weather will normalize once the Wizzrobe is defeated."
Hyrule Compendium description

Fire Wizzrobes are enemies in The Legend of Zelda: Breath of the Wild. They are Wizzrobe variants. They wield Fire Rods which they use to hurl fireballs and can summon fire monsters to aid them in battle. They can also severely raise the temperature around them, though the weather will return to normal after they are defeated.

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