SFS Standard Nonlethal Spell [one-action] Feat 2

Source Player Core pg. 171
Archetypes Peacekeeper (Feat 4)
You can alter offensive spells to be less deadly. If your next action is to Cast a Spell that deals damage and doesn't have the death or void trait, that spell gains the nonlethal trait.

Archetype Use

This feat can be used for one or more Archetypes in addition to the listed Classes. When selected this way, the feat is not considered to have its class traits.

Traits

Manipulate:Actions with this trait require you to physically manipulate an item or make gestures to use. Creatures without a suitable appendage can't perform actions with this trait. Manipulate actions often trigger reactions.
Spellshape:Actions with the spellshape trait tweak the properties of your spells. These actions usually come from spellshape feats. You must use a spellshape action directly before Casting the Spell you want to alter. If you use any action (including free actions and reactions) other than Cast a Spell directly after, you waste the benefits of the spellshape action. Any additional effects added by a spellshape action are part of the spell's effect, not of the spellshape action itself.