From Melvor Idle
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Superheat is a family of Magic (skill).svg Alt. Magic spells that allow the player to magically turn ores into bars. There are four versions of the spell, with each version requiring a higher Magic (skill).svg Magic level and more Runes to cast but providing a stronger effect.

Superheating gives Magic (skill).svg Magic experience. The same amount of experience is given no matter what type of bar is created – as with any spell, XP does not depend on the items involved.

In order to Superheat a specific type of bar, players need the same Smithing (skill).svg Smithing level that would be required to smelt the bar normally. Superheating does not grant any Smithing (skill).svg Smithing experience or Mastery.svg Mastery experience, and Mastery bonuses will not apply.

The Crown of Rhaelyx (item).png Crown of Rhaelyx's chance to save materials does not work while Superheating, nor does Puff, the Baby Dragon (pet).svg Puff, the Baby Dragon or the Smithing Skillcape (item).svg Smithing Skillcape's ability to save coal. Aorpheat's Signet Ring (item).svg Aorpheat's Signet Ring's chance to double resources gained does work.