Buy OSRS Steam rune
The Steam rune is a combination rune in Old School RuneScape. It works as one fire rune and one water rune at the same time. Any spell that needs a fire rune, a water rune, or both will only use one Steam rune. This saves space in your inventory and rune pouch.
Steam runes are handy for spells that need both water and fire runes. These include Kourend Castle Teleport at Magic level 48, Ape Atoll Teleport at level 64, Bake Pie at level 65, Humidify at level 68, and Magic Imbue at level 82. The last three are on the Lunar spellbook.
Players can make Steam runes with the Runecraft skill at level 19 or higher. This is done at the Water Altar or the Fire Altar with pure essence, runes, and a talisman. They can also be bought with Pizazz points from the Mage Training Arena.
Some staves give unlimited Steam runes when equipped. These are the twinflame staff, the steam battlestaff, and the mystic steam staff. If you cast spells that use fire and water runes, Steam runes are a smart pick.