Amulet of the Crypt Keeper

Wondrous item, very rare (requires attunement by a spellcaster)

This silver amulet is in the shape of a mausoleum. An eerie fog seeps from its interior. While wearing it, you have resistance to necrotic damage.

The amulet can have up to 20 charges at a time. When found, it has 1d10 + 10 charges. You can use an action while wearing it to touch a creature's corpse and speak the amulet's command word. If the corpse isn't that of a construct or undead, the corpse is magically reduced to ash, and the amulet gains a number of charges equal to the creature's Challenge Rating or level (rounded up; maximum of 10).

Spells. While wearing this amulet, you can use an action to expend 5 of its charges to cast one of the following spells from it as a 5th-level spell, using your spell save DC or spell attack bonus: false life, fear, inflict wounds, or speak with dead.

Summon Flesh Golem. While wearing the amulet, you can use an action to expend 20 of its charges to magically summon a flesh golem. The golem appears in an unoccupied space within 10 feet of you. This golem has resistance to necrotic damage, is undead, and has features reminiscent of the corpses used to generate the charges used for this property. The golem is friendly to you and your companions, and takes its turn immediately after you. It obeys your verbal commands (no action required). If you don't issue it any commands, it defends itself from hostile creatures, but otherwise takes no actions. This golem can't be calmed down once it goes berserk. The golem turns to ash and is destroyed when it drops to 0 hit points, when this property is used again, or once it's gone berserk for 1 hour; the golem immediately goes berserk if you are no longer attuned to or wearing the amulet. Once this property has been used, it can't be used again until the next dawn.

When the souls of the damned are bent and twisted, they inevitably seek recompense.