Born of Three Thunders

 
Prerequisite(s): Knowledge (Nature) 4+ ranks, Energy Substitution (Electrical)
 
Benefit: When you cast a spell with the electrical or sonic descriptor, you can declare it to be a spell of the three thunders and split the damage between electrical and sonic. In addition, any creature that takes damage from the spell, must make a fortitude check or be stunned for one round. Stunned creatures must make a reflex check or fall prone. The caster is dazed for one round after casting regardless of the outcome.
 
Source: Complete Arcane