Energy +10
Fire damage: 11-22 (req. 9 Fire Magic)
Halves casting time of Fire Magic spells (Chance: 20%)
Halves skill recharge of spells (Chance: 20%)
Health +30
Health +30
25k is the max you can get out of it. Maybe less if you want to sell quick.
Granted the boss takes ages to reach, the staff competes with a cheaper Exuro Will (same stats but 5-7k), and Blisterbark (better stats at similar price 25k).