Octonocular Mask

Wondrous item, rare (requires attunement)
  This incredibly lightweight picosilk mask is so tactile and responsive that the wearer’s expression is fully visible through the mask. The eight eyes have different functions; some provide increased peripheral vision, some are enchanted with divination magic to see a few picoseconds into the future, and some look into ‘the dangerspectrum’, a visual representation of incoming doom.
  Drider Sense. You have an uncanny ability to sense when something is afoot, an insatiable itch that alerts you to impending danger. While wearing the octonocular mask you can’t be surprised and creatures don’t gain advantage on attack rolls against you as a result of being hidden from you.
  In addition, as a reaction to being the target of an attack or having to make a Dexterity saving throw to avoid damage, you can use your reaction to add your proficiency bonus to your AC or the result of the saving throw, respectively. You do not have to see the source of the attack or effect to do so. Once you use this feature, you can’t do so again until you finish a short rest.
  If you are incapacitated by something other than nonmagical sleep, then the Drider Sense property does not function.