feat Born of the Three Thunders
Born of the Three Thunders

You have learned to marry the power of lightning and thunder in your electricity and sonic spells.
(Complete Arcane, p. 76)
- Prerequisite: Energy Substitution (electricity) , Knowledge (nature) 4 ranks,
- Benefit: When you cast a spell with either the electricity descriptor or the sonic descriptor that deals hit point damage, you can declare that spell to be a spell of the three thunders, with half its damage dealt as electricity damage and half dealt as sonic damage. In addition, the spell concludes with a mighty thunderclap that stuns all creatures that take damage from the spell for 1 round unless they succeed on a Fortitude save, then knocks stunned creatures prone unless they succeed on a Reflex save (both saves at the same DC as the base spell).
Channeling the three thunders is costly, though, and you are automatically dazed for 1 round after doing so. A three thunders spell uses a spell slot of the spell’s normal level. In addition, its descriptor changes to include both energy types–for example, a lightning bolt of the three thunders is an evocation [electricity, sonic] spell.
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