Try going (Cloistered) Cleric with the Fire and Magic domains, take the PH2 variant to spontaneously cast spells from the Fire domain, and get wands and scrolls of choice wizard spells that you otherwise can't cast. Get Divine Metamagic for maybe Maximize or Twin Spell, some metamagic rods, etc. Be sure to get a Rod of Empower and do the Fire Seeds trick, that should be able to blow up anything not immune to fire in just one shot.

Another option could be to use Archivist, but you'd have to take Sacred Exorcist to get Divine Metamagic.


A Psion (Kineticist) is one of the best blasters in the game. If you're able to use psionics, that should be among your top choices.