Superheat item

Superheat item is a conversion spell available at level 43 Magic that allows the player to smelt ores into metal bars while away from a furnace. It costs 4 fire and 1 nature rune to use, and yields 106 experience per successful cast. It also yields the appropriate Smithing experience for smelting the ore.

This spell is particularly helpful while Mining because it decreases the number of trips to a bank, while also saving time smelting the ores later, and receiving Magic XP as a bonus.