The Mask of Many Faces
Wondrous item, Legendary (requires attunement by a Bard)
This magic item appears as a plain white porcelain mask with no straps or apparent way to keep it on your face.
Putting it on causes a brief moment of pain as it to fuses to your face and attunes to you. Once attuned, you can use it as an arcane focus and it cannot be removed from your face by any means while you are alive. While it is attuned to you can move its position around your head with no discomfort, however it must be over your face to use any of its abilities or gain their effects. As an action, you can change the mask from its current form to another one that it knows.
When you finish a long rest you may subtly alter the mask’s basic appearance. When you do so, select one skill from Deception, Intimidation, Performance, or Persuasion. You have advantage on all Charisma checks using that skill while wearing the mask. This effect lasts until you finish your next long rest.
Sentience. The Mask of Many Faces is a sentient chaotic good mask with an Intelligence of 12, a Wisdom of 14, and a Charisma of 20. It has hearing and darkvision out to a range of 120 feet, but can only see in the direction it's facing on your head. The mask can speak, read, and understand Common, and can communicate with its wearer both verbally and telepathically, its voice changing with its face. While you are attuned to it, The Mask of Many Faces also understands every language you know.
Personality. Though its voice changes with its form The Mask of Many Faces always speaks in a Shakespearian style.
Forms
Mask of the Mimic
Prerequisites: Mimic, Doppelganger or similar shape changer
While the mask is in this form you can cast the spell disguise self at will, without expending a spell slot. Additionally you can change the face of this mask and the rest of your head to the face or head of any creature you have seem when you cast disguise self using this mask.
Funerary Mask
Perquisites: Zombie
While the mask is in this form, you can cast Feign Death on yourself at will or as a reaction to taking damage, without expending a spell slot. You can end the spell on your turn as a bonus action.
Mask of the Living Shadow
Prerequisites: None
While the mask is in this form, you gain darkvision out to a range of 60 feet. If you already have darkvision from your race, its range increases by 30 feet. Additionally, while in darkness, you are invisible to any creature that relies on darkvision to see you in that darkness.
In Thine Own Eyes
Prerequisites: Mimic, Doppelganger or similar shape changer
While the mask is in this form, you may select one creature that you can see and force it to make a Wisdom saving throw against your spell save DC. If the target fails the saving throw it will not realize you are wearing a mask and will consider you a member of its race. This feature does not alter the way the creature behaves toward you aside from this effect. This effect lasts for a number of minutes equal to your Charisma modifier (minimum of 1). On a successful save, there is no effect and the target is unaware of what you attempted. The target creature must be no more or less than one size category different than you.
Mask of the Feykind
Prerequisites: Fey
While you are wearing this mask, you may attempt to hide in natural elements even if you are only lightly obscured by them.
Mask of the Fiendkind
Perquisites: Fiend
While you are wearing this mask, when you successfully take the Hide action, you may turn invisible as a bonus action. You remain invisible until you move or take any action.
Mask of the Unknowable
Perquisites: Eldrazi or other Aberration
While you are wearing this mask, other creatures have disadvantage on Wisdom (Insight) checks made against you, and you have advantage on all wisdom saving throws.
Mask of Stone Face
Perquisites: gargoyle
The face of a gargoyle at rest. While wearing this mask, your AC increases by 2 and while you remain motionless you are indistinguishable from an inanimate statue as your body and equipment take on the appearance of stone. Quirk
While you are wearing this mask you have an extreme dislike of all birds.
Mask of the Illusionist
Perquisites: creature with the ability to cast an Illusion spell or create illusionary effects
When you unlock this mask, you learn the Minor Illusion cantrip. The cantrip doesn't count against your number of cantrips known, and when you cast Minor Illusion, you can create both a sound and an image with a single casting of the spell. Additionally, you can choose one inanimate, nonmagical object that is part of the illusion and make that object real. You can do this on your turn as a bonus action while the spell is ongoing. The object remains real for 1 minute. The object can't deal damage or otherwise directly harm anyone.
Mask of the Vampire
Perquisites: vampire
While wearing this mask you gain a special Bite attack. You are proficient with this melee attack, which uses Charisma for attack rolls and deals 1d6 necrotic damage. The damage increases at 5th level (2d6), 11th level (3d6), and 17th level (4d6). You regain hit points equal to half of the necrotic damage dealt.
The Stranger
Prerequisites: already known
A nearly featureless mask that seems to blend into those around it. You becomes one with the crowd and are nearly unrecognizable. No one remembers you while you wear it, no matter how many times they speak to you or what you do, this includes allies.
Snuggly Duckling
Prerequisites: already known
The adorable face of a baby duck, fresh bill and fluffy feathers begging to be stroked. You get advantage on all Persuasion checks and can double you jump distance while wearing this mask. Being in the presence of bread requires a DC 15 Wisdom save or you are compelled to eat it and will stop at nothing to achieve eating said bread, using all actions to consume the bread until a successful DC15 Wisdom save is achieved or the bread is gone.