Harrowcall Veil

A Harrowcall Veil is a magical item that hides covered creatures who stand still. Morrigan created a set of three "long ago for a particular friend for a particular job" but the recipient was killed before the veils could be used. She gifted them to Bells Hells as they left Ligament Manor to sabotage a Malleus Key.

Description
A single Harrowcall Veil can cover up to three medium- or small-sized creatures; though this was the initial description, Matt later allowed four creatures if Orym (small) stood on the shoulders of Chetney Pock O'Pea (small), factoring in Orym's halfling ability to move through the space of creatures larger than him. While they are standing still, these covered creatures have +10 to their Stealth checks for up to an hour. If the veil moves, the enchantment "stretches" and its magic ends. A veil can be used only once a day.

Morrigan said that the magic would help them in shaded areas of the Feywild, but it is not yet clear if the magic works only in shadows or if she was broadly referring to the group's venture into the Sun's Shadow. It is not clear if the enchantment works outside the Feywild.