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Crafting double nats in the abyss is one of the oldest runecrafting money making methods to exist. This method also allows you to train the slow runecrafting skill at a moderate rate. All you need to do for this method is fill your inventory with as many pure essence as you can, filling your pouches and familiar till the brim, and head into the wilderness. You then need to make your way over to the abyss and enter it by talking to the wizard. You then need to enter the inner circle and find the nature hole and enter it. You then enter the altar portal and create your runes. You then teleport to Edgeville and repeat. A more detailed guide can be found in the video linked below. Using this method, you can easily get upwards of 4 million gold per hour with relatively low stats.