Multiattack

The voidling makes 4 tendril attacks.

Tendril

Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 10 (1d8 + 6) slashing damage plus 11 (2d10) necrotic damage.

Necrotic Burst (Recharge 5-6)

The voidling releases a burst of necrotic energy in a 20-foot radius sphere centered on itself. Those in the area take 35 (10d6) necrotic damage, or half damage with a successful DC 17 Constitution saving throw.