Sometimes you are unable to cast this, and receive an in-game message, "You don't feel that you should cast this with enemies around". If this happens, kill the giant bats and goblins directly outside the room to fix the problem.
If you try to cast this with Slagilith alive, you would receive this message, "You're a little too busy fighting to cast that right now."
Once she has been freed, the player must return to Phantewti in Seers' Village in order to complete the next step in the quest.
In King's Ransom, it is needed to free King Arthur from the statue underneath the Black Knights' Fortress. The scroll is obtained again by simply talking to Wizard Cromperty.
If you have destroyed the scroll, you can make a new one by using Iron Oxide on an Emerald.