Kluka
Auto-translated
How to determine the damage of a wall of fire?
The main formula is 10*CS+{10,basic|20,advanced|50,expert}
For the Sylvan faction, it is multiplied by 2.
Therefore, for CS=8 and expert-level fire magic (which is what the scrolls are for), (10*8+50)*2 = 260. This is enough to destroy 10 Gryphons.