Base - Black Star of Shar

The Black Star of Shar is a perversion of a Star of Selûne, one of a set of interlocking diadems, seven in number, said to bless champions of She Who Guides. Touched by the negative energies of Shadowfell, often by the hands of Shar's disciples, this diadem exudes dark powers.

While any creature may don the diadem, it begrudgingly favors those who worship Shar. It urges its wearer to pursue its inscrutable goals.

This tarnished silver diadem shapes itself to fit the head of the attuned creature, and a void-black sapphire rests upon the forehead. When brought together, the diadems can be connected through a series of intricate locking mechanisms.

An attuned creature that willingly tries to purify the diadem takes 24d6 necrotic damage. This damage ignores resistance and immunity, and can’t be reduced or avoided by any means. A creature reduced to 0 hit points by this damage disappears in a whirling void and is destroyed, its possessions being deposited in a random location in Shadowfell.

Diadem Attunement

To attune to this item, you don the diadem and spend a short rest communing with the diadem. It rejects interlocking with other Black Stars of Shar, though it will encourage the attuned to corrupt a Star of Selûne, should one be in their possession.

Random Properties 

The Black Star of Shar has the following random properties:

• 3 minor beneficial properties
• 1 major beneficial properties
• 3 minor detrimental properties
• 2 major detrimental properties

Charges 

The Black Star of Shar has 28 charges. It regains 1d4+3 expended charges daily at dusk.

Spells

While wearing the Black Star of Shar, you can use an action to cast one of the following spells from it, expending additional charges to raise the level: Bane (1 charge), Inflict Wounds (1 charge), Blindness/Deafness (2 charges), Bestow Curse (3 charges), Revivify (3 charges), Blight (4 charges), Contagion (5 charges), Negative Energy Flood (5 charge), Harm (6 charges), and Clone (8 charges).

These spells use your proficiency and spellcasting ability modifier.

Only one instance of Clone may be active. If it is cast again, the new spell takes hold and the old clone becomes inert.

Increased Charisma

While attuned and wearing the diadem, your Charisma score increases by 4, to a maximum of 28.

Shroud of Stars 

While attuned and wearing the diadem, you gain a protective shroud of night sky. You may cast Darkness at will, centered on the diadem. The diadem maintains concentration of the spell for you, and you can dismiss or manifest the shroud as a bonus action. If any of this spell's area overlaps with an area of light created by a spell of 5nd level or lower, the spell that created the light is dispelled. You and creatures you designate are not affected by the shroud. In addition, celestials and worshipers of Selûne within the shroud take 2d6 necrotic damage per round.

Imbued With Shadow

All radiant damage dealt by you is converted to necrotic, and gains an additional 1d8 damage.

Sentience

The Black Star of Shar is a sentient chaotic evil diadem with an Intelligence of 14, a Wisdom of 10, and a Charisma of 18. It has hearing and darkvision out to a range of 120 feet.

The diadem can speak, read, and understand Celestial as well as any language the attuned creature understands. In addition, it can communicate telepathically with the attuned creature. When it communicates, it speaks in an agonized whisper.

Personality

The diadem's bond to Selûne is severed and replaced with a foul connection to the shadow weave. While a hidden aspect of itself desperately seeks to be purified, it is enslaved to Shar's inscrutable will, thus each diadem is compelled to corrupt. Unless the wearer is a worshipper of Shar, it makes efforts, subtle or otherwise, to convert the wearer or convince it to unknowingly carry out tasks in Shar's name. If the wearer works against the diadem's purpose, a contest of wills happens.

If a diadem has a flaw, it is prone to fits of rage and self-loathing.

Demiplane of Shadows

If the attuned creature is a worshiper of Shar, they can expend two charges to cast a variant of Demiplane (8th-level, 2 charges). All created demiplanes are connected to Shadowfell, and the creator always has a fail-safe escape, regardless of attunement. When escaping one of these demiplanes in such a manner, it collapses and dumps the creator into a random location in Shadowfell.

Destroying the Diadem

The Black Star of Shar can’t be destroyed as long as Selûne is alive. However, the diadems can be purified by remaining steeped in the moonlight of Selûne every night for 1d100 days. When purified, it becomes empowered as a Star of Selûne, and the sapphire brightens to its former luster.