So my player is playing a Bard 5/Dragon Disciple X and she is curious if this would work:
Improved Eldritch Heritage: You gain Breath Weapon equal to character level -2.
Dragon Disciple: Bloodline abilities increase equal to dragon disciple level.
So at level 11, a Bard 5/Dragon Disciple 6 with IEH, would her breath weapon deal 15d6 damage? (6 from DD, 11 minus 2 from character level)
I have half a mind to allow it, since I like my players having a nice nova option, especially for a character who would normally be contented just slashing her opponents to death, but occasionally wants to smote her enemies to nothingness.
Prerequisites: Cha 13, Skill Focus with the class skill of bloodline selected for this feat (see below), character level 3rd.
Benefit: Select one sorcerer bloodline. You must have Skill focus in the class skill that bloodline grants to a sorcerer at 1st level (for example, Heal for the celestial bloodline). This bloodline cannot be a bloodline you already have. You gain the first-level bloodline power for the selected bloodline. For purposes of using that power, treat your sorcerer level as equal to your character level – 2, even if you have levels in sorcerer. You do not gain any of the other bloodline abilities.
The character isn't eligible for the feat since Draconic is a bloodline she already possesses Further, Improved Eldritch Heritage says that effective sorcerer level for the power is CL-2, regardless of actual sorcerer level (which implies effective sorcerer level from other sources, such as Dragon Disciple). Even if you allow her to use the feat, I would not recommend allowing the effective levels to stack to over her character level.
The character isn't eligible for the feat since Draconic is a bloodline she already possesses Further, Improved Eldritch Heritage says that effective sorcerer level for the power is CL-2, regardless of actual sorcerer level (which implies effective sorcerer level from other sources, such as Dragon Disciple). Even if you allow her to use the feat, I would not recommend allowing the effective levels to stack to over her character level.Prerequisites: Cha 13, Skill Focus with the class skill of bloodline selected for this feat (see below), character level 3rd.
Benefit: Select one sorcerer bloodline. You must have Skill focus in the class skill that bloodline grants to a sorcerer at 1st level (for example, Heal for the celestial bloodline). This bloodline cannot be a bloodline you already have. You gain the first-level bloodline power for the selected bloodline. For purposes of using that power, treat your sorcerer level as equal to your character level – 2, even if you have levels in sorcerer. You do not gain any of the other bloodline abilities.
Well the Bard/DD doesn't have a bloodline, really. There's this in the prerequisite for Dragon Disciple:
Spellcasting: Ability to cast 1st-level arcane spells without preparation. If the character has sorcerer levels, he must have the draconic bloodline. If the character gains levels of sorcerer after taking this class, he must take the draconic bloodline.
The character doesn't have a bloodline, until it's taken sorcerer levels.
Also this:
Blood of Dragons: 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.
I don't think that's the same as having a bloodline? It's like "If you have a bloodline, X; if you don't, X"
However, you're probably right on the interpretation of it not stacking? Paizo is generally wary of abilities exceeding what character level would normally allow...