[Shadow] Item - Umbrashroud

It's said that pure, refined gloomsilk is blessed by the shadow god Tenebor himself. A cloak woven from such divine thread could literally become one with the formless dark.

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Umbrashroud
Wondrous item, rare (requires attunement)

While you wear this cloak, you have darkvision out to a range of 60 feet, if you don't already have it.

Gloomsilk Weave. This cloak is woven from gloomsilk, an enchanted dark thread. While you wear this cloak, you can attempt to Hide from a creature when you are lightly obscured from it by dim light or darkness. The cloak's camouflage does not obscure as well as physical cover would; if you move out of your space while you are hidden this way, you are no longer hidden.

Umbral Stride. While attuned to the cloak, you can draw from the extensive magic of shadows. When you are in an area of dim light or darkness, you can use an action to gain a flying speed of 40 feet that lasts for 1 hour. This fly speed is suppressed while you are in an area of bright light or incapacitated. When the duration ends, you can't use this action again for 1d12 hours. 

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Very Rare Variant: Shielding Shadows. The very rare version of this shroud also has the Shielding Shadows property. When a creature you can see targets an ally within 5 feet of you with an attack, you can use your reaction to grant your ally half cover against the attack.

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DESIGN COMMENTARY

5e doesn't value flight as that valuable, probably because by the time you hit Uncommon or Rare rarity, it's already available as a spell. Or that certain races already gain flight. Anyway, this shroud is balanced against the Rare item Wings of Flying, which provides flight at 60 feet every 1d12 hours; the Umbrashroud provides less fly speed and requires darkness to function; hence it offers some secondary abilities. Hiding in dim light or darkness is very useful especially to Rogues (note that dim light appears as bright light to those with darkvision, so you'd have to stand still in darkness to make this work). Hiding is good here, though movement limitations restricts it to mainly combat use.

The gloomsilk is another fabric that'll be introduced in this compendium. Perhaps I'll gun for a Fibromancy compendium later on, and add this new material to it.