I am starting a campaign in which my character is an accomplished and award-winning chef, and in an egg-themed competition won a dragon egg with a pseudodragon. I've talked with my DM, and he's letting me replace the "Sting" ability with the ability to shoot small fire breaths! The entire point of this is to allow my chef character to be able to cook and use the dragon breath as a creme brulee torch. Back on topic now.
The fire breath I am using in this example to scale down is for the Adult Red Dragon, whose actions state:
Fire Breath (Recharge 5-6): The Dragon exhales fire in a 60-foot cone. Each creature in that area must make a DC 21 Dexterity saving throw, taking 63 (18d6) fire damage on a failed save, or half as much damage on a successful one.
I don't want to necessarily do 18d6 damage to my tasty creations, but I would like for it to be a living being that assists me in my culinary creations. The goal is to depower the dragon's breath for a much smaller (tiny) sized creature, enough so that it does not end up with a miniature fireball cannon but with enough that it can suitably replace that of it's lost ability of "sting".
The ability I've created is as such:
Flame Puff. The Dragon exhales fire in a 1-foot cone. Each creature in that area must make a DC 11 Constitution saving throw, taking 4 (1d4+2) fire damage on a failed save, or half as much damage on a successful one. If the saving throw fails by 5 or more, the target is set aflame, and takes 1d4/2 (Minimum 1) fire damage for 3 turns, or until it makes a DC 11 Constitution saving throw. The dragon can choose to cut off the flame early or extend its duration until its concentration ends (as if concentrating on a spell) if being used in a non-combat situation.
Does my created ability replacing the pseudodragon action "Sting" break my pseudodragon to be too strong compared to a normal psuedodragon?