Allison, The Puppet Master

Evasion. When you are subjected to an effect that allows you to make a DEX saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail.

Multiattack. The necromancer makes three Arcane Burst attacks.

Arcane Burst. Melee or Ranged Spell Attack: +7 to hit, reach 5 ft. or range 120 ft., one target. Hit: 25 (4d10 + 3) necrotic damage.

Spellcasting. The necromancer casts one of the following spells, using Intelligence as the spellcasting ability (spell save DC 15):

At will: dancing lights, mage hand, prestidigitation, Telepathic bond but only targeting a mana puppet monster.

2/day each: bestow curse, dimension door, mage armor, web, animate dead

1/day: circle of death, Danse Macabre

Summon Undead (REcharge 5-6). Allison magically summons five mana puppets. The summoned creatures appear in unoccupied spaces within 60 feet of the necromancer, whom they obey. They take their turns immediately after the necromancer. Each lasts for 1 hour, until it or the necromancer dies, or until the necromancer dismisses it as a bonus action.

Grim Harvest. When the necromancer kills a creature with necrotic damage, the necromancer regains 9 (2d8) hit points.

Split Second Decision (3/day). When targeted by a spell that requires a direct line of sight, Allison can yank one of her mana puppets into the line of fire, preventing her from taking the damage and instead turning it to her puppet. 

Allison, The Puppet Master may take 3 legendary actions and may only take these actions at the end of another creature's turn

Dash. Allison moves her movement speed in a singular direction

Gelak's Boon(2 actions).  Allison siphons energy from her mind flayer partner giving her advantage on dexterity and strength saving throws until the beginning of her next turn.