Admixture Breath is a paragon tier feat available to dragonborn characters level 11 or higher with the dragon breath racial power and the Adaptable Breath feat. Benefit: When you use your dragon breath power, you can mix any two of the damage types to which you have access. Your dragon breath deals both types of damage. This doesn't increase the amount of damage you deal, but a creature must be able to resist or be immune to both damage types to reduce or ignore the damage. If a creature is vulnerable to either damage type, it is considered to be vulnerable to damage from your dragon breath.