I have a 5th level Draconic sorcerer that I'm thinking of taking on the Dragon Disciple prestige class at the next level(6th). At Dragon Disciple 3rd level you get a breath weapon even if your sorcerer level isn't high enough to get it. My question is, when determining how many damage dice to roll, is it per level of the Dragon Disciple prestige class, or per level of the sorcerer class or a total of the two classes?
Thanks!
Going off these:
At 9th level, you gain a breath weapon. This breath weapon deals 1d6 points of damage of your energy type per sorcerer level. Those caught in the area of the breath receive a Reflex save for half damage. The DC of this save is equal to 10 + 1/2 your sorcerer level + your Charisma modifier. The shape of the breath weapon depends on your dragon type (as indicated on the above chart). At 9th level, you can use this ability once per day. At 17th level, you can use this ability twice per day. At 20th level, you can use this ability three times per day.
A dragon disciple adds his level to his sorcerer levels when determining the powers gained from his bloodline. If the dragon disciple does not have levels of sorcerer, he instead gains bloodline powers of the draconic bloodline, using his dragon disciple level as his sorcerer level to determine the bonuses gained. He must choose a dragon type upon gaining his first level in this class and that type must be the same as his sorcerer type. This ability does not grant bonus spells to a sorcerer unless he possesses spell slots of an appropriate level. Such bonus spells are automatically granted if the sorcerer gains spell slots of the spell's level.
They would stack. So a Sorcerer 5/Dragon Disciple 5 would be a Sorcerer 10 effectively, so it would be 10d6.