5e spells is a mod that adds many PHB spells to the game.
This includes Dragon's Breath which may be cast on other party members and deals Fire, lightning, Poison, Acid, or Cold in a 15' cone for ten rounds (Gale must concentrate). 4d6 damage when gale cast as level 3 spell.
Your
Imp is now a DPSer as Gale hangs back to concentrate and cast ranged spells.
Lightning: Better wear your Sparkswall ring because I hear there is rain in the forecast.
Who needs Homebrew?