Make Leather

Make Leather is a lunar spell unlocked by training at the Livid Farm. It costs 489,200 produce points to unlock (roughly 26 hours of Livid Farm). When used it tans 5 hides of any kind. This a great way to make money while training magic, although the time and effort required to unlock the spell may seem unappealing to some. Using Make Leather, a player can easily gain over 75,000 experience and make 2,000,000 coins an hour, depending on the cost of the hides that they are tanning, as it is possible to cast the spell 850 – 900 times per hour. However, other methods that require a similar magic level are faster experience (such as String Jewellery).

The Make Leather spell cannot be used to turn yak-hides into cured yak-hides.

With the use of the spell Borrowed Power or Spellbook Swap (for High Level Alchemy) one can stay at the dragons for as long as desired and train the Crafting skill.

Cost analysis
Assuming a fire staff is used.