Introduction
The Spellfire Adept feat leans hard into spells which deal Radiant damage, allowing you to convert your own Hit Point Dice into additional spell damage and allowing you to bypass resistance to Radiant damage. If you’re built to lean heavily on Radiant damage, it’s a great feat. Otherwise, you’ll find little value here.
Spellfire Adept requires the Spellfire Spark feat.
Ability Score Increase
Any mental stat. Easy for casters.
Fueled Spellfire
If you have good multi-target radiant damage spells, this is absolutely worth the cost. I would rarely bother adding this to single-target spells, though. Note that this only applies to a single damage roll of the spell, so you can’t use this multiple times with spells like Spirit Guardians.
Searing Spellfire
Resistance to Radiant damage is extremely rare. Radiant damage is typically used to bypass damage resistances to more common damage types like Fire damage.