Vicious Roasting

You unleash a string of insults laced with subtle enchantments at a creature you can see within range. If the target can hear you (though it need not understand you), it must succeed on a Wisdom saving throw or take fire damage depending on the severity of the insult(half on a success). Roll a performance check, 6 or below the damage die is 2d4 +Spell Attack Modifier, 12 or below the damage dice is 2d6 +Spell Attack Modifier, 19 or below the damage dice is 2d8+Spell Attack Modifier, 20 or above the damage die is 2d12+Spell Attack Modifier. With a 1 on the die, take the lowest possible damage value for each damage dice. With a 20 on the die, take the highest possible value for each of the damage dice

The player MUST roast the target at a level of fire that must match or exceed the character's performance roll, if not then the DM can rule the roast as insufficient and lower the damage dice accordingly.

This spell's number of damage dice increases by 1 for each level above 1st