Spellcasting. Zaspira Zatish is a 9th-level spellcaster. Her spellcasting ability is [CHA] (spell save DC 20, +12 to hit with spell attacks). Zaspira Zatish has following [Warlock] spells prepared:
Cantrips (at will): [Eldritch Blast] (3 beams, 1d10+6 each, [Toll the Dead] (2d12 necrotic, 2d8 if at full hp), [Chill Touch] (1d8 necrotic, prevents healing), [Minor Illusion]
1st level (4 slots) casts at 5th level: [Blight] (8d8 necrotic drains life), [Counterspell], [Darkness], [Fear], [Greater Invisibility], [Hunger of Hadar], [Vampiric Touch] (Hit for 6d6 and heal half)

6th level (1 slot) [Circle of Death] (10d6 necrotic in 60-ft radius)

7th level (1 slot) [Finger of Death] (7d8+ 30 necrotic, raises a zombie)

8th level (1 slot) [Maddening Darkness] (120-ft radius of magical darkness, psychic damage)

9th level (1 slot) [Power Word Kill] (Instant kill on HP < 100)

Hellfire Pact (Orcus's Boon)

• Once per long rest, Zespira can cast any necromancy spell as a bonus action without expending a spell slot.

Necrotic Aura (Recharge 5-6)

• 30-ft radius of pure necrotic energy erupts around her.
• Creatures in range take 6d8 necrotic damage (DC 18 Con save for half).

Life Drain Strike (Melee Spell Attack, +12 to hit, reach 10 ft.)

• Hit: 6d10 necrotic damage, and the target’s max HP is reduced by the amount of damage taken.

Orcus’s Whisper (Recharges after Short Rest)

• Target within 120 feet must make a DC 19 Wisdom Save.
• On a fail, they are frightened and paralyzed until the start of Zespira’s next turn.

Cloak of Shadows (1/Day, Bonus Action)

• Zespira turns invisible for 1 minute or until she attacks/casts a spell.

Legendary Resistance (3/Day)

If Zespira fails a saving throw, she can choose to succeed instead.