Incorporeal Movement. The wraith can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.

Multiattack. The Wraith Swordsman makes 3 attacks with its sword or 2 attacks with the sword and a Life Drain attack.

Sword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 21 (3d6+5) slashing damage.

Life Drain. Melee Spell Attack: +5 to hit, reach 5 ft., one creature. Hit: 21 (6d4 + 2) necrotic damage. The target must succeed on a DC 14 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.

Deflective Parry (1/round). When a creature makes a melee attack against the undead swordsman and hits, the swordsman can use its reaction to add 3 to its AC for that attack, potentially causing the attack to miss. The undead swordsman must be wielding a melee weapon to use this ability.