Feat Effect: Effect: Heaven's Thunder

Granted by Heaven's Thunder

Your unarmed attacks and any monk weapons you wield deal additional electricity and sonic damage; the amount of each damage type is equal to the number of damage dice for the weapon or unarmed attack.

If you also know the qi blast qi spell, you can choose to deal either electricity or sonic damage with the spell instead of force (qi blast loses the force trait and gains the electricity or sonic trait instead).