Generic, Text: Third Eye

The retina of a beholder has been made into a new eyestalk and grafted on your back. The new eye gifts you with its original powers as well as increased perception. Easily hidden by a cloak or even a simple shirt, it is one of the preferred grafts for assassins and short-term spies.
Graft Location. Back/Spine.
Description. A purple stalk surges from your back, fused to your back or spine. While the eye helps with perception and situational awareness, it also brings some of the paranoïa of its former   The colour of the iris depends on the power it wields.
Activation. The perception boost is an always active passive ability. The magic beam is activated through will alone, functioning like a normal limb and has 3 charges. A short rest recharges 1d2-1 charges, while a long rest recharges all 3 charges.
Effect. The eye's magical properties originate in its retina, meaning that it can fire the magical beam it did as a part of a beholder. The DC is equal to 10 + your Constitution modifier. The beam is affected by anti-magic.
It also gives the choice between awareness during sleep (in exchange for needing to sleep on your side or face-down) and adding your proficiency bonus to Perception, Investigation and Insight checks based on sight(in addition to any proficiency or expertise). This choice is made during the graft, as the grafter meddles with your nerves.
Construction. Requires Fall Warpgrafter, 3'700 gp, and 9 days.
Graft Donor. The retina of a beholder's eyestalk.
Graft Sacrifice. -1 hp, -1 Wisdom, subtract your proficiency bonus on checks to maintain your sanity.
Price. 8'000 gp.