The Hat of the Sharp Caster is a rare Helmet that rerolls the die(s) on spell attack rolls.
All you need now is a holster for your wand, tobacco to chew, and some sort of pack animal to ride, and you'll look like a complete and utter bingus.
Properties
Helmets 
Rarity: Rare
Weight: 0.5 kg / 1 lb
Price: 50 gp
Special
The wearer of this item gains:
- Sharp Caster: When you roll a 1 or 2 on a damage die(s) for a Spell Attack, that die(s) is rerolled once.
Where to find
- Sold by Tara in the Lower City. Tara can be found on the roof of The Devil's Fee at X: -38 Y: 17, though she only appears if previously spoken to on the roof of the Open Hand Temple with Gale in your party [Needs Verification] and will only accept Fish in exchange for this item.