Actions

Multiattack. The wight makes two longsword attacks or two Grave Bolt attacks. It can use its Life Drain in place of one longsword attack.
Grave Bolt. Ranged Spell Attack: 1d20+5 to hit, range 120 ft., one target. Hit: 7 1d8+3 necrotic damage.
+1 Longsword. Melee Weapon Attack: 1d20+4 to hit, reach 5 ft., one target. Hit: 6 1d8+2 slashing damage, or 7 1d10+2 slashing damage if used with two hands.
Life Drain. Melee Weapon Attack: 1d20+4 to hit, reach 5 ft., one creature. Hit: 5 1d6+2 necrotic damage. The target must succeed on a DC 13 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.