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Hag Eye
Other
G
A hag coven can craft a magic item called a hag eye, which is made from a real eye coated in varnish and often fitted to a pendant or other wearable item. The hag eye is usually entrusted to a minion for safekeeping and transport. A hag in the coven can take an action to see what the hag eye sees if the hag eye is on the same plane of existence. A hag eye has AC 10, 1 hit point, and darkvision with a radius of 60 feet. If it is destroyed, each coven member takes 3d10 psychic damage and is blinded for 24 hours.
A hag coven can have only one hag eye at a time, and creating a new one requires all three members of the coven to perform a ritual. The ritual takes 1 hour, and the hags can't perform it while blinded. During the ritual, if the hags take any action other than performing the ritual, they must start over.
Source: Monster Manual p. 177
3d10
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Heartstone
Other
G
This lustrous black gem allows a night hag to become ethereal while it is in her possession. The touch of a heartstone also cures any disease. Crafting a heartstone takes 30 days.
Source: Monster Manual p. 179
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Soul Bag
Other
G
When an evil humanoid dies as a result of a night hag's Nightmare Haunting, the hag catches the soul in this black sack made of stitched flesh. A soul bag can hold only one evil soul at a time, and only the night hag who crafted the bag can catch a soul with it. Crafting a soul bag takes 7 days and a humanoid sacrifice (whose flesh is used to make the bag).
Source: Monster Manual p. 179