Magic Resistance. Adellaide has Advantage on saving throws against spells and other magical effects.

Spider Climb. Adellaide can climb difficult surfaces, including along ceilings, without needing to make an ability check.

Web Walker. Adellaide ignores movement restrictions caused by webs.

Multiattack. Adellaide makes two Rend attacks, and she can use Spellcasting to cast Web or Dominate Person if available.

Rend. Melee Attack Roll: +8, reach 5 ft. Hit: 25 (6d6 + 4) Necrotic damage.

Blood Disgorge (Recharge 6). Constitution Saving Throw: DC 15, each creature in a 20-foot Cone. Failure: 27 (6d8) Necrotic damage. Success: Half damage. Failure or Success: A target cannot regain hit points for 1 minute (save ends at end of turn).

Spellcasting. Adellaide casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 15):

At Will: Detect Thoughts, Gaseous Form (self only, appears as a cloud of bats), Web
1/Day: Dominate Person

Shape-Shift. Adellaide shape-shifts into a Medium spider, a Medium bat, or back into her true form. Her game statistics are the same in spider form, but as a bat she can take no actions other than the Dodge, Disengage, and Dash actions, and she gains a flying speed equal to her walking speed. Any equipment she is wearing or carrying isn’t transformed.

Blood-Soaked Escape. Trigger: Adellaide is hit by an attack roll. Response: Adellaide halves the attack’s damage to herself (round down), and she teleports to an unoccupied space she can see within 30 feet of herself. Constitution Saving Throw: DC 15, each creature within 5 feet of Adellaide’s destination space. Failure: The target has the Poisoned condition until the end of its next turn. While Poisoned, it has the Incapacitated condition.