The Guardian charges can be useful to lower level characters, but mostly as a novelty, unless the character has happened upon a lot of Firebolt books.

Stats

Mindcry
Quarterstaff

• Damage: 6-12
• +15 Magic
• 69 Guardian Charges
• +15% Resist All
• Spells are +1 Level
• Requirements: 20 Strength
• Durability: 69
• Quality level: 20
• Availability: Single Player and Multiplayer