SFS Standard Big Bang [three-actions] Feat 14

Source Player Core pg. 148
Frequency once per hour
Requirements You’re photon-attuned.
You manifest a fragment of the cosmic forces from the Universe's first moments, unleashing a blast of scouring cosmic fire that reverts all things to their basic components and overcomes even magical defenses. This deals 10d6 fire damage to all creatures in a 30-foot emanation. You and any number of adjacent allies are unaffected by this Big Bang. Affected creatures can attempt a Reflex save against your class DC.
Critical SuccessThe creature is unaffected.
SuccessThe creature takes half damage.
FailureThe creature takes full damage and 2d6 persistent fire damage.
Critical FailureThe creature takes double damage and 4d6 persistent fire damage, and you can attempt to counteract a spell on the creature, using half your level, rounded up, as the counteract rank.

Level (+1) Increase the damage by 1d6.

Traits

Attuned:You can't use abilities with the attuned trait while you're unattuned. Many attuned abilities require you to be specifically graviton-attuned or photon-attuned, while others can grant additional benefits based on your current stellar attunement.
Disharmony:Actions with the disharmony trait change your current stellar attunement to being unattuned. When you take such an action with this trait, you benefit from the additional effect of your current attunement if the action had the attuned trait, but once you complete the action, you become unattuned.