Fireball
Fireball is a spell learned at the Draconian Lair's Spell Training Hut.
This follows a pattern. Offensive spells in Shilla, seriously, suck. This is another example.
Generally, it seems like the damage is level * 1000. So at level 5000, you only would do 5 million damage. Then figure in magic resistance, and your doing nothing but wasting experience. Avoid at all costs.