Wild "Fires"

When casting the Firebolt cantrip, if your attack roll is 8 or lower (before modifiers), you instead cast Create Bonfire at the targets location and can not maintain concentration on the spell. You must have the "Create Bonfire" and "Firebolt" cantrips and may not cast "Create Bonfire" normally.  This feat is negated once your spellcasting ability score total reaches 20 and you may then retrain the "Firebolt" or "Create Bonfire" cantrip or begin casting the "Create Bonefire" normally. If you retrain the "Firebolt" cantrip, "Create Bonfire" has it's range increased to 120 ft. and damage roll changed to a d10, and 5th level, 11th level, and 17th level damage increases becomes a d10.