Source: Dragon #313
By tapping into an alternate energy source, you can supercharge the raw energy of energy-based spells and powers.
Prerequisite: Any one of the following feats: Agitated Causticity, Astral Fire, Bioelectrical Surge, or Solid Freeze
Benefit: When you take this feat, you choose an energy type that matches the energy type represented by the psi-spell feat that allowed you access to Energy Flare (acid for Agitated Causticity, fire for Astral Fire, and so on). This feat can be applied to any spell or power that has an energy descriptor matching this energy type.
You increase the damage die type of a spell or power with the appropriate energy descriptor by one step (d4 becomes d6, d6 becomes d8, and so on). The number of damage dice remains unchanged.
To apply Energy Flare to a spell, the caster must expend 4 power points per spell level. To apply it to a psionic power, the manifester must spend 2 spell levels per power level. The feat need not be used in combination with its prerequisite feat, although it can be.
Special: This feat can be taken more than once. Each time it is taken, it applies to a different energy descriptor and requires the corresponding prerequisite.