Eldritch Secrets.
Choose one:

• Deadly Insight. Gains advantage on ranged attack rolls and scores a critical hit on 18–20.

• Fel Will. Once per turn, may replace a saving throw with a Charisma saving throw.

• Hidden Arcana. Increases total spell slots by 3 (maximum 6).

• Unfathomable Essence. Immune to necrotic damage; resistant to all but radiant.

Pact of the Blade.
The Accursed Guard’s weapon is magical, gains a +3 bonus to attack and damage rolls, and reappears at the start of its turn if disarmed.

Multiattack.
The Accursed Guard makes two Pact Blade attacks. It can forgo one attack to cast a cantrip.

Pact Blade.
Melee Weapon Attack: +10, reach 5 ft., one target.
Hit: 1d8+6 slashing plus 5d8 force damage.

Greater Eldritch Blast (Recharge 5–6).
Ranged Spell Attack: +9, range 120 ft., one target.
Hit: 10d10 force damage.

Spellcasting

The Accursed Guard is an 11th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 17, +9 to hit with spell attacks). It does not require material components.

Cantrips (at will): Chill Touch, Eldritch Blast, Mage Hand
1st–5th Level (3 total slots): Armor of Agony, Hex, Mirror Image, Misty Step, Hallucinatory Terrain