|773,900 per hour|
The profit rate assumes 120 kills per hour. Your actual profit may be higher or lower depending on your speed.
Mithril dragons have a 100% drop of dragon bones and three mithril bars, in addition to dropping many High Level Alchemy items. Using Soul Split in addition to good defensive armour can keep you at or near full health while killing them. Mithril dragons are weak to earth spells, although with a chaotic staff or better and a high Magic level, any type of spell will have 100% accuracy against them. Super antifires are highly recommended, as using an anti-dragon shield or equivalent will inhibit your efficiency, and cut into your profit per hour.
They are located on the upper level of the Ancient Cavern, which requires Barbarian Training to access. The area is multicombat and the dragons are aggressive. Drink your super antifire, pray Soul Split and possibly Torment, and start attacking one of them with basic abilities, using the thresholds Wild Magic and Asphyxiate when available. Pick up the mithril bars, dragon bones and any other items worth keeping, and repeat. When your inventory and your war tortoise or pack yak are full, use the TokKul-Zo to teleport next to the TzHaar Fight Cave, and bank your loot. Run north to the fairy ring and use the code bjq to return to the Ancient Cavern.
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