Pure essence, Old School RuneScape Wiki

Pure essence is a raw material used in the Runecrafting skill to make runes that are only available to members. They can create the same runes as rune essence as well as cosmic, chaos, astral, nature, law, death, wrath and any combination runes. Pure essence does not provide any bonus over rune essence when crafting runes lower than cosmic runes; therefore, when crafting lower-tier runes, it is recommended to use whichever essence is less expensive at the time. To be teleported, you need to have

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Pure essence, Old School RuneScape Wiki