Cultist Mage (18th)

Dark Devotion. The cultist has advantage on saving throws against being charmed or frightened.

Special Equipment. The sidekick has an Arcane Grimoire, +1.

Spellcasting. The sidekick is a 18th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 20, +12 to hit with spell attacks). It has the following mage spells prepared:

Cantrips (at will): light, chill touch, fire bolt, toll the dead

1st level (4 slots): absorb elements, fog cloud, shield

2nd level (3 slots): misty step, web

3rd level (3 slots): dispel magic, counterspell, fireball, sleet storm

4th level (3 slots):

5th level (1 slot): wall of force

Potent Cantrips. The sidekick can add its Intelligence modifier to the damage it deals with any cantrip.

Empowered Spells. Whenever the sidekick casts an evocation spell using a spell slot, it can add its Intelligence modifier to the spell’s damage or healing roll, if any.

Scimitar. Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: 4 (1d6 + 1) slashing damage.