Shadow Yai

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.

Requirements The shadow yai is in an area of dim light or darkness or is standing in the shadow of any Large or larger object

The shadow yai instantly teleports to another location that's in dim light or darkness or to a space that's in the shadow of any Large or larger object within 60 feet.

This monster regains the listed number of Hit Points each round at the beginning of its turn. Its Dying condition never increases beyond Dying 3 as long as its regeneration is active. However, if it takes damage of a type listed in the regeneration entry, its regeneration deactivates until the end of its next turn. Deactivate the regeneration before applying any damage of a listed type, since that damage might kill the monster by bringing it to Dying 4.

Trigger A creature within the monster's reach uses a manipulate action or a move action, makes a ranged attack, or leaves a square during a move action it's using. Effect The monster attempts a melee Strike against the triggering creature. If the attack is a critical hit and the trigger was a manipulate action, the monster disrupts that action. This Strike doesn't count toward the monster's multiple attack penalty, and its multiple attack penalty doesn't apply to this Strike.

The shadow yai takes on the appearance of a Shadow Giant. This doesn't change its Speed or Strike attack and damage. 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.

A shadow yai's touch harms their target's spiritual essence in addition to its body. A creature hit by the shadow yai's fist Strike must attempt a DC 36 will save. Critical Success The creature is unaffected. Success The creature takes 2d6 void damage. Failure The creature becomes Drained 1 and takes 3d6 void damage. As long as the creature is drained as a result of this ability, it loses the ability to speak above a whisper. When the creature attempts to Cast a Spell with a verbal component, it must succeed at a flat check or the spell is disrupted. The DC of this flat check is equal to 5 plus the creature's drained value (for example, DC 7 if the creature is drained 2). Critical Failure As failure, but the creature becomes Drained 2 and takes 6d6 void damage.