Multiattack. The bandit makes three Dagger attacks.
Dagger. Melee or Ranged Attack Roll: +6, reach 5 ft. or range 20/60 ft. Hit: 8 (2d4 + 3) Piercing damage plus 10 (3d6) Poison damage.
Blinding Flash (Recharge 4–6). Constitution Saving Throw: DC 14, each creature in a 10-foot-radius Sphere centered on a point the bandit can see within 120 feet. Failure: 13 (3d6 + 3) Radiant damage, and the target has the Blinded condition until the start of the bandit's next turn. Success: Half damage only.
Spellcasting. The bandit casts one of the following spells, using Intelligence as the spellcasting ability (spell save DC 14):
At will: Disguise Self, Mage Hand, Minor Illusion