Multiattack. The mage makes three Arcane Burst attacks.
Arcane Burst. Melee or Ranged Attack Roll: +6, reach 5 ft. or range 120 ft. Hit: 16 (3d8 + 3) Force damage.
Spellcasting. The mage casts one of the following spells, using Intelligence as the spellcasting ability (spell save DC 14): At Will: Detect Magic, Light, Mage Armor (included in AC), Mage Hand, Prestidigitation 2/Day Each: Fireball (level 4 version), Invisibility 1/Day Each: Cone of Cold, Fly
Bonus Actions
Misty Step (3/Day). The mage casts Misty Step, using the same spellcasting ability as Spellcasting.
Reactions
Protective Magic (3/Day). The mage casts Counterspell or Shield in response to the spell's trigger, using the same spellcasting ability as Spellcasting.
Senses: Passive Perception 14. Languages: Common plus three other languages. Skills: Arcana +6, History +6, Perception +4. Gear: Wand. Speed: 30 ft..
RollQuest ships the D&D 2024 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.