Vansidieth

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.

If the vansidieth uses a damaging spell or makes a Strike on their turn but doesn't deal any damage that turn, they take (4d6+6) mental damage at the end of their turn and their imperious gaze aura deactivates until the end of their next turn.

30 feet. A non-demon creature that ends their turn in the aura must attempt a DC 37 will save. If it fails, the demon's dismissive glance incurs overwhelming feelings of inferiority, causing the creature to become Slowed 1 for 1 round as it doubts itself and hesitates.

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.

Frequency once per minute Effect The vansidieth attempts to Demoralize all foes within 30 feet (rolling one attempt against all enemies' Will DCs). If the vansidieth critically succeeds against at least one enemy, the demon becomes Quickened for 1 round on their next turn and can use the extra action each round to Demoralize or Feint.

Frequency once per round Effect The vansidieth orders allied creatures within 15 feet that are level 17 or lower to Step, Stride, or Strike; affected creatures can take the commanded action immediately as a free action.