Archnecromancer

Magic Resistance. The archnecromancer has advantage on saving throws against spells and other magical effects.

Spellcasting. The archnecromancer is an 18th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 17, +9 to hit with spell attacks). The archmage can cast animate dead, create undead and summon undead at will and has the following wizard spells prepared:

Cantrips (at will): chill touch, spare the dying, ray of frost, prestidigitation, toll the dead

1st level (4 slots): detect magic, identify, mage armor*, false life

2nd level (3 slots): detect thoughts, mirror image, misty step, ray of enfeeblement, lesser restoration

3rd level (3 slots): counterspell, fly, spirit shroud, revivify, vampiric touch

4th level (3 slots): banishment, shadow of moil, stoneskin*

5th level (3 slots): cone of cold, scrying, wall of force, raise dead, greater restoration

6th level (2 slot): globe of invulnerability, soul cage, harm

7th level (2 slot): teleport, resurrection, finger of death

8th level (2 slot): Abi-Dalzim's Horrid Wilting, Clone, Demiplane, Maddening Darkness

9th level (1 slot): invulnerability, time ravage, wish, true resurrection,

Paralyzing Touch. Melee Attack: +7 to hit, reach 5 ft. Hit: 4 (3d6) cold damage.

The target must succeed on a dc 18 Constitiution saving throw or be paralyzed until the end of the Archnecromancers next turn.