Grim (5e Equipment)

Weapon (any sword), legendary (requires attunement)

Adorned with skulls inlaid into the blade of the weapon, this weapon has the unnatural ability to absorb the souls of any creature that dies within 120' of it. Whenever you attack with this weapon, the hunger within the weapon causes nominal backlash, sending pain vibrating up your arms (no damage is taken). You have a +1 bonus to attack and damage rolls made with this weapon.
If a non-undead and non-construct creature of CR 3 or less as died within the past turn, you may use an action to absorb its soul if the creature's body is within 120 feet of you. After the creature has been absorbed, you may as an action to summon the creature within 10 feet of you, or a bonus action to dismiss the creature. Whenever you summon this creature, you take 1d4 necrotic damage for every CR of the monster you are summoning. (1d4 for CR 1, 2d4 for CR 2, 3d4 for CR 3). This damage cannot be reduced in any way.
This creature is friendly to you and your allies and follows a verbal command if you succeed DC 14 Charisma check. The creature has the same stats as before, but with the added Undead sub-type and will obey your commands unless it is injured by either you or your allies, at which point it will become hostile to you. If the creature dies again, the soul is lost and you may not re-summon the creature.