Arcane Trickster

Sneak Attack. Once per turn, the arcane trickster deals an extra 14 (4d6) damage when it hits a target with a weapon attack and has advantage on the attack role, or when the target is within 5 feet of an ally of the arcane trickster that isn't incapacitated and the arcane trickster doesn't have disadvantage on the attack role.

Cunning Action. On each of its turns, the arcane trickster can use a bonus action to take the Dash, Disengage, or Hide action.

Spellcasting. The arcane trickster is a 5th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 14, +6 to hit with spell attacks). The arcane trickster has following wizard spells prepared:
Cantrips (at will): infestation, mage hand, ray of frost, thunderclap

1st level (4 slots): disguise self, ice knife, shield

2nd level (3 slots): hold person, invisibility, misty step, scorching ray

3rd level (2 slots): counterspell, fireball, major image

Multiattack. The arcane trickster makes three melee attacks with its rapier.

Action Melee Attack. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 4) piercing damage. 

Uncanny Dodge. When an attacker that you can see hits you with an attack, you can use your reaction to halve the attack’s damage against you.