Risen Reaver

Blood Sense. The risen reaver can pinpoint the location of creatures that aren't Constructs or Undead within 60 feet of it and can sense the general direction of such creatures within 1 mile of it.

Undead Nature. The risen reaver doesn't require air, food, drink, or sleep.

Multiattack. The risen reaver makes three Bladed Fist attacks.

Bladed Fist. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 15 (2d10 + 4) slashing damage.

Skitter. The risen reaver takes the Dash action.

Infused Arsenal. When the risen reaver is hit with a nonmagical melee weapon or when it starts its turn in the same space as a nonmagical melee weapon that isn't being worn or carried, it absorbs the weapon into its body. If the weapon is being wielded by an attacker, the attacker must succeed on a DC 15 Strength saving throw or lose its weapon. For 1 minute, the reaver has resistance to the type of damage dealt by that weapon, and when it hits with its Bladed Fist, the fist deals an extra 2 (1d4) damage of the type dealt by the weapon. The reaver can absorb no more than three weapons in this way every 24 hours.