Derro, Voidwarped

Insanity. Advantage on saves vs. being charmed or frightened.

Mortal Void Traveler. Doesn't require air or ambient pressure.

Sunlight Sensitivity. In sunlight disadvantage on attacks and Wis (Perception) checks that use sight.

Void-Touched Weapons. Its weapon attacks are magical. When it hits with any weapon deals extra 1d6 cold and 1d6 force (included below).

Multiattack. Two Shortswords and one Void Tendril attack.

Shortsword. Melee Weapon Attack: +7 to hit, 5 ft., one target, 7 (1d6+4) piercing damage + 3 (1d6) cold and 3 (1d6) force.

Void Tendril. Melee Weapon Attack: +7 to hit, 10 ft., one target, 7 (2d6) bludgeoning damage + 3 (1d6) cold and 3 (1d6) force. Target must make DC 15 Con save or its hp max is reduced by the amount equal to the damage taken. This reduction lasts until target finishes a long rest. Target dies if this reduces its hp max to 0.

Void Speech Rant (Recharge 5-6). Spews a tirade of Void Speech. Each creature within 40' of it that can hear the tirade: 27 (5d10) psychic and is incapacitated until the end of its next turn (DC 15 Wis half damage and isn't incapacitated).