Processing magic equipment and writing scrolls had the same problem, they both had a high possibility of failure. The higher grade the magic equipment, the easier it was to fail. When Saleen was reprocessing the witcher spider he had actually failed because the magic patterns had damaged it.
The secretions from the lightning dragon were a main ingredient for the solidifying stabilizing medicine. Humans could no longer capture lightning dragons, so such medicine was incredibly valuable.
It was a necessary ingredient when it came to processing holy weapons or half-god weapons, and to ensure that a holy weapon could be processed successfully, a mage would pay any price.
