The Helm of Marthgul

Wondrous item, very rare (requires attunement)

This golden, three-horned helm looks old, and no amount of cleaning changes this fact. A faded green gem rests in the center, it is said that those who stare into its facets lose themselves in its horror. Each horn is black as if had been charred, but is as hard as steel to the touch.

You gain the following benefits while wearing it:

• You can cast Speak with Dead at will.
• You can use an action to cast one of the following Spells (save DC 18), Contagion, Create Undead, Finger of Death, Raise Dead, or Soul Cage. Each time a spell is cast in this way one of the horns crumbles into ash. After a long rest the horns reappear atop the helm.
• As long as the helm has one horn, you have Resistance to necrotic damage.
• As long as the helm has one horn, The Helm emits darkness in a 30-foot radius when at least one Undead is within that area you can see through the darkness.