The masks of the Shadar Kai

You obtain a wooden mask. This mask grants you two of the following benefits:

• Your AC increases by one when you wear the mask. 
• While wearing the mask you can avert your eyes, no action required and if you are averting your eyes you have a blindsight range of 15 feet.
• When wearing the mask your attacks do an extra 1d6 necrotic damage. When you reach level 11 it deals an extra 2d6 necrotic damage instead. This can only be used once per turn.
• When you are wearing the mask the range of your Raven Queen’s Blessing trait increases by fifteen feet.
• When someone else is wearing the mask you can use your bonus action to have them use a use of your Raven Queen’s Blessing trait. Once used this feature cannot be used until you finish a long rest.

Additionally while on the Shadowfell you have immunity to necrotic damage, while wearing the mask.