Aramaskus Radomir

Signature Spells. Aramaskus Radomir can cast fireball and lightning bolt once without expending a spell slot. Once he does so, he can’t cast them again until he finishes a short or long rest.

Sculpt Spells. When Aramaskus Radomir casts an evocation spell, he can choose a number of creatures equal to 1 + the spell’s level. Those creatures automatically succeed on their saving throws against the spell, and they take no damage if they would normally take half damage on a successful save.

Potent Cantrip. When a creature succeeds on a saving throw against his cantrip, the creature takes half the cantrip’s damage but suffers no additional effects.

Overchannel. Aramaskus Radomir can deal maximum damage with any wizard spell of levels 1 through 5 that deals damage. The first time he does so, he suffers no adverse effect. If he uses this feature again before he finishes a long rest, he takes 2d12 necrotic damage for each level of the spell, immediately after he casts it. Each time he uses it again before a long rest, the necrotic damage per spell level increases by 1d12.

Spellcasting. Aramaskus Radomir is a 20th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 20, +12 to hit with spell attacks). He can cast thunderwave and scorching ray  at will.  Aramaskus Radomir has following wizard spells prepared:
Cantrips (at will): fire bolt, mage hand, ray of frost, shocking grasp, light
1st level (4 slots): magic missile, burning hands, witch bolt, fog cloud

2nd level (3 slots): gust of wind, flaming sphere, shatter

3rd level (3 slots): fireball, lightning bolt, fly

4th level (3 slots): conjure minor elementals, fire shield, wall of fire

5th level (3 slots): cone of cold, conjure elemental, Bigby's hand

6th level (2 slots): chain lightning, flesh to stone

7th level (2 slots): delayed blast fireball, prismatic spray

8th level (1 slot): incendiary cloud

9th level (1 slot): meteor swarm

Multiattack. Aramaskus makes three rapier attacks.

Rapier. Melee Weapon Attack: +10 to hit, reach 5 ft., 1 target. Hit: 12 (2d8 + 4) piercing damage. 

Parry. Aramaskus Radomir can add 4 to his AC against one melee attack. To do this, he must be wielding a melee weapon and be able to see the attacker.