pf2e.fyi
From Pathfinder #216: The Acropolis Pyre, which isn't enabled.

Akki (Level 2)

CREATURE 2
UNIQUEMEDIUMHUMANOIDTENGU
Perception +8; low-light vision
Languages Common, Tengu, Iblydan
Skills Acrobatics +6, Athletics +8, Intimidation +6, Performance +8, Sailing Lore +7, Survival +6
Str +4, Dex +2, Con +3, Int +1, Wis +0, Cha +2
Items Falchion, Javelin (3), Scale Mail, Grappling Hook, Rope
AC 17; Fort +11, Ref +8, Will +6
HP 38; Resistances electricity 2
Blood Storm (electricity)
Frequency once per day
Trigger Akki takes piercing or slashing damage
Effect Akki's blood sprays from the wound, forming a crimson cloud laced with tiny lightning bolts. Adjacent creatures take 1 electricity splash damage, and Akki is Concealed until the end of her next turn.
Speed 25 feet
Melee Falchion +10 (forceful, sweep), Damage 1d10+4 slashing plus Tempest Rage
Melee Javelin +10 (thrown 30), Damage 1d6+4 piercing plus Tempest Rage
Melee Tournament Greatclub +10 (backswing, nonlethal), Damage 1d10+4 bludgeoning plus Tempest Rage
Tempest Rage (concentrate, electricity, emotion, mental)

Akki channels the ferocity of a raging storm, causing her feathers and weapons to crackle with electricity. She gains 5 temporary Hit Points, deals an additional 1d4 electricity damage with her weapon Strikes, and cannot use actions (except Seek) with the concentrate trait unless they also have the rage trait. These effects last for 1 minute, until she falls Unconscious, or until the encounter ends, whichever comes first. After Akki uses this ability, she cannot do so again for 1d10 minutes.

Thunderous Echo (sonic)
Trigger Akki fails but does not critically fail a Strike against a target within 15 feet
Requirements Akki is affected by Tempest Rage
Effect Even though her attack missed, a thunderclap follows an instant later in the weapon's wake. The Strike's target takes 1d4 sonic damage (DC 16 basic Fortitude save). The target is Deafened for 1d4 rounds if they critically fail the saving throw.
Pathfinder #216: The Acropolis PyreORC