SFS Standard Booming Bootloader [free-action] Feat 6

Source Tech Core pg. 58
Frequency once per 10 minutes
Your summoned creature appears with unexpected fanfare and brilliant destruction. If your next action is to Cast a Spell with the summon trait, all creatures in a 10-foot emanation around the creature you summoned take 1d4 sonic damage per spell rank of the spell cast, with a basic Fortitude save against your spell DC.

Traits

Concentrate:An action with this trait requires a degree of mental concentration and discipline.
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.