Multiattack

The derro makes two scimitar attacks or two heavy crossbow attacks.

Scimitar

Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) slashing damage plus 9 (2d8) necrotic damage.

Heavy Crossbow

Ranged Weapon Attack: +7 to hit, range 100/400 ft., one target, Hit: 9 (1d10 + 4) piercing damage plus 9 (2d8) necrotic damage.

Infectious Insanity (Recharge 5-6)

The derro chooses a creature it can see within 30 feet and magically assaults its mind. The creature must succeed on a DC 13 Wisdom saving throw or be affected as if by a confusion spell for 1 minute. An affected creature repeats the saving throw at the end of its turns, ending the effect on itself on a success.