Spellfire Adept

Spellfire Adept
Feat
Prerequisite: Level 4 or Feature: Spellcasting, Pact Magic

You gain the following benefits.
Fueled Spellfire.
Once per turn, when a spell you cast deals Radiant damage, you can expend up to two Hit Point Dice, roll them, and add the total rolled to one damage roll of the spell.
Searing Spellfire.
When you make a damage roll that deals Radiant damage, it ignores Resistance to Radiant damage.

Source: Forgotten Realms: Heroes of Faerûn (FRHoF), page 41