Caldera Oni

Greater Darkvision — A creature with greater darkvision can see perfectly well in areas of darkness and dim light, though such vision is in black and white only. A creature with greater darkvision can see through even forms of magical darkness.

Bean Panic — Oni are curiously afraid of beans, especially as the seasons begin to change. If a creature Interacts to throw a handful of beans at the oni, the oni becomes Frightened 2. While frightened this way, their weakness to spirit damage is increased by 5. The oni then becomes immune to bean panic for 24 hours.

Reactive Strike —

Stoke the Volcano — When the caldera oni is critically hit, the flames of anger grow within them. They recharge their choice of Ash Form or Dance of Burning War.

Ash Form (polymorph, primal) — Frequency once per minute

Effect The caldera oni transforms into a cloud of sparking volcanic ash and then Flies. This movement doesn't trigger reactions, and the caldera oni can move through small gaps and spaces occupied by other creatures.

The caldera oni then returns to its physical form, affected by a 4th-rank Enlarge spell with a duration of 1d4 rounds.

Change Shape (concentrate, polymorph) — The caldera oni can take on the appearance of any Medium or Large humanoid creature. This doesn't change their Speed or their attack and damage bonuses with their Strikes but might change the damage type their Strikes deal (typically to bludgeoning).

The monster changes its shape indefinitely. It can use this action again to return to its natural shape or adopt a new shape. Unless otherwise noted, a monster cannot use Change Shape to appear as a specific individual. Using Change Shape counts as creating a disguise for the Impersonate use of Deception. The monster's transformation automatically defeats Perception DCs to determine whether the creature is a member of the ancestry or creature type into which it transformed, and it gains a +4 status bonus to its Deception DC to prevent others from seeing through its disguise. Change Shape abilities specify what shapes the monster can adopt. The monster doesn't gain any special abilities of the new shape, only its physical form. For example, in each shape, it replaces its normal Speeds and Strikes, and might potentially change its senses or size. Any changes are listed in its stat block.

Dance of Burning War — Frequency once per minute

Effect The oni's heat becomes overwhelming, causing them to breathe out superheated ash and dance across the battlefield. The caldera oni Strides, then makes a melee Strike. If the Strike hits, the oni can Stride again and Strike again, repeating this until they have either missed with a Strike or made three Strikes total.

The oni then finishes the dance by calling down volcanic lightning through the cloud of ash. Each creature hit by a Strike during the dance takes 3d6 fire plus 3d6 electricity{3d6 fire damage and 3d6 electricity damage} with a DC 34 Reflex save.