Shadow Cloak. The Voidweaver has advantage on Dexterity (Stealth) checks made to hide in dim light or darkness.

Voidbound. The Voidweaver is immune to any effects that would banish, teleport, or otherwise forcibly move it across planes.

Innate Spellcasting. The Voidweaver's innate spellcasting ability is Charisma (spell save DC 18). It can innately cast the following spells, requiring no material components:

At will: darkness, detect thoughts, shadow blade 3/day each: dispel magic, fear, shadow step, greater invisibility

Void Form. As a bonus action, the Voidweaver can transform into a swirling mass of void energy. While in this form, it gains the following benefits:

• It can move through other creatures and objects as if they were difficult terrain.
• It takes half damage from non-magical weapon attacks and has resistance to all damage from spells.
• It can move through areas of darkness or dim light as if they were normal terrain.
• It gains a fly speed of 80 ft. The Voidweaver remains in this form until it uses a bonus action to revert to its true form.

Psi (Psionics). The Voidweaver has the following psionic abilities. Its psionic spellcasting ability is Intelligence.

• At will: mage hand (telekinetic version), mind spike
• 3/day each: psionic blast, shadow mind, telekinesis
• 1/day: psychic scream Voidweaver's Psi Save DC 18
• Voidweaver's Psi Attack Modifier +9

Multiattack. The Voidweaver makes three attacks: two with its Shadow Tendrils and one with its Void-infused Claws.

Shadow Tendrils. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 20 (3d8 + 6) necrotic damage, and the target must succeed on a DC 18 Strength saving throw or be grappled (escape DC 18). Until this grapple ends, the target is restrained, and the Voidweaver can't use its tendrils on another target.

Void-infused Claws. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) slashing damage plus 15 (4d6 + 3) psychic damage.

Shadow Warp (Recharge 5-6). The Voidweaver teleports up to 120 feet to an unoccupied space it can see. It then makes a Shadow Tendrils attack against any creature within 10 feet of its destination.

Terrorizing Gaze. The Voidweaver targets one creature it can see within 60 feet of it. If the target can see the Voidweaver, it must succeed on a DC 18 Wisdom saving throw or become frightened until the end of its next turn.

Cosmic Surge (Recharge 6). The Voidweaver unleashes a surge of cosmic energy in a 30-foot radius centered on itself. Each creature in that area must make a DC 18 Dexterity saving throw, taking 40 (10d6 + 5) force damage and 40 (10d6 + 5) psychic damage on a failed save, or half as much damage on a successful one.

The Voidweaver can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time, and only at the end of another creature's turn. The Voidweaver regains spent legendary actions at the start of its turn.

• Shadow Tendrils. The Voidweaver makes a Shadow Tendrils attack.
• Void Step. The Voidweaver uses its Void Form ability without expending a bonus action.
• Cosmic Blast (Costs 2 Actions). The Voidweaver releases a concentrated blast of cosmic energy in a 60-foot line. Each creature in that line must make a DC 18 Dexterity saving throw, taking 45 (10d8) force damage and 45 (10d8) psychic damage on a failed save, or half as much damage on a successful one.