Simandu

Constant Spells — A constant spell affects the monster without the monster needing to cast it, and its duration is unlimited. If a constant spell gets counteracted, the monster can reactivate it by spending the normal spellcasting actions the spell requires.

Aura of Whispered Secrets (aura, mental, occult) — 30 feet. The soft sound of whispering fills the area, and those in the area hear their own voice whispering among the voices. A creature that enters the area or begins their turn in the area must attempt a DC 38 Will save. On a failure, they become distracted by the conviction that their own voice is whispering out their secrets, and the creature becomes Off-Guard until the start of their next turn.

Darting Legs —

Change Shape (concentrate, occult, polymorph) — The jorogumo takes on the appearance of any Small or Medium spider. This doesn't change their Speed or Strikes.

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.

Jorogumo Venom (incapacitation, poison) — Saving Throw DC 41 Fortitude
Maximum Duration 4 hours

Stage 1 3d6 poison damage and Stupefied 1 (1 round)

Stage 2 3d6 poison damage and Stupefied 2 (1 round)

Stage 3 4d6 poison damage and Stupefied 2 (1 round)

Stage 4 Paralyzed for 1d4 hours

Sneak Attack — Simandu deals 3d6 extra precision damage to creatures who are Off-Guard.

Spider Legs (concentrate, occult, polymorph) —

Web Trap — A creature hit by the jorogumo's web attack is Immobilized and stuck to the nearest surface, preventing the creature from moving.

The DC to Escape or Force Open the web trap is 34.

Whispered Revelation (incapacitation, mental, occult) — Simandu whispers an overwhelming secret to an adjacent creature—the nature of the secret is so staggering that the creature's mind immediately recoils from the truth and forgets it; the creature must then attempt a DC 41 Will save.

Critical Success The creature is Off-Guard until the end of Simandu's turn.

Success The creature is Slowed 1 for 1 round.

Failure The creature is Stunned 3.

Critical Failure The creature becomes Paralyzed for 1 minute. At the end of each of its turns, it can attempt a new DC 41 Will save to end this effect early.