Ashak-Tal, the Crown of Undeath (5e Equipment)
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Wondrous item, artifact (requires attunement by a spellcaster who knows the Animate Dead and Create Undead spells)
This ancient crown was once worn by the first wizard to discover the secrets of necromancy. It was forged from black iron by duergar slaves, set with rubies shaped by Deep Gnomes and cooled in Drow blood. The frontal spine is created from the bones of a slain Dracolich. Wearing the crown has the following benefits:
When you cast Animate Dead, you can target an extra d8 corpses or skeletons per casting. When you cast Create Undead, you can create one additional ghoul. The crown has 20 charges, and regains each of them each dawn. You can use an action to choose an appropriate corpse, spend one or more of these charges, and create each of the following:
1 charges- specter, warhorse skeleton
3 charges- ogre zombie, minotaur skeleton, ghast, mummy, will-o-wisp
5 charges- wraith, flameskull, beholder zombie
7 charges- vampire spawn
15 charges- mummy lord, vampire
These creatures are under your control when raised, and remain so indefinitely. At the start of each of your turns, any undead within 120 ft of you that is not already under your control must pass a DC 20 Wisdom saving throw or become under your control, following your orders to the best of its ability.
You can also use an action to destroy an object within 30 ft of you that can deal radiant damage. If the chosen object has a Charisma score, it must make a DC 20 Charisma saving throw or be destroyed. Artifacts have advantage on this saving throw. If the chosen object does not have a Charisma score and is being worn or carried by a creature, that creature makes a DC 20 Charisma saving throw instead; on a failed save, the chosen object is destroyed. If the chosen object does not have a Charisma score and isn't being worn or carried by a creature, the object is destroyed. Once this ability has been used, it can't be used again until the next dawn.
The crown is a sentient artifact with Int 20, Wis 14 and Cha 18. It desires its wearer to rule the living and undead across the world, and be the greatest necromancer ever. It presses its wearer to seek out new dark secrets and magical treasures. It hates gods of undeath with a passion, and strives to destroy such beings as Orcus. It drives its wearer to acts of evil in order to gain power. It does not wish to rule, but simply to bask in the power of a global rule of undeath.