Balthazar

Plane Shift. Balthazar has the ability to Plane Shift once per long rest as a 7th-level spell.

Quarterstaff. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit:  (1d6 + 1)

Spellcasting. Balthazar is a 11th-level wizard. His spellcasting ability is Intelligence (spell save DC 18, +10 to hit with spell attacks). He has the following spells prepared:

Cantrips (at will): mage hand, prestidigitation, ray of frost

1st level (4 slots): detect magic, mage armor, magic missile

2nd level (3 slots): blur, mirror image

3rd level (3 slots): fireball, fly

4th level (3 slots): banishment, dimension door

5th level (2 slots): telekinesis, wall of force

Counterspell. Balthazar can use his reaction to counter a spell that he can see being cast. He must make an Intelligence (Arcana) check against the spellcaster's spell DC. If he succeeds, the spell fails and has no effect.

Balthazar can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Balthazar regains spent legendary actions at the start of his turn.

Cast a Cantrip. Balthazar casts a cantrip.

Arcane Blast (Costs 2 Actions). Balthazar targets one creature within 60 feet and makes a ranged spell attack against it, using a spell slot of 1st level or higher. On a hit, the target takes (1d10 + 6) in force damage.

Blink (2/day) Balthazar can cast blink at will without expending a spell slot.