Type: Metapsionic
Source: Dragon #287
You can modify a power that uses one type of energy to mix an equal amount of another type of energy.
Benefit: Choose one type of energy: acid, cold, electricity, fire, or sonic for which you already have selected for the Psionic Energy Substitution feat. You can modify a power with an energy designator to add an equal amount of the chosen type of energy. The altered power works normally in all respects except for the type of damage dealt. For instance, a sonic admixtured fireball would deal 5d4 points of sonic damage and 5d4 points of fire damage.
Even opposed types of energy, such as fire and cold, can be combined using this feat. An admixed power costs a number of power points equal to its standard cost +8.
Special: You can gain this feat multiple times, choosing a different type of energy each time. You can use Psionic Energy Admixture to further alter a power that has already been modified with Psionic Energy Substitution. You can also use Psionic Energy Admixture to include your chosen energy type with a power that already uses the same type, in effect doubling the damage dice.