Island of Khora
A small device used by Grant to aid in his search for phantasms. It looks like a small golden looking glass but has been magically enchanted to show changes in temperature.
This is used to find hot or cold spots and track the movement of phantasms, it can also detect and track any warm-blooded creatures. It was even able to see a cultist hidden underneath the Cloak Of Invisibility.
Heatvision: While looking through this monocle you see a dark purple, but the temperature of living creatures can be seen as a whitish glow. This allows you to clearly see living creatures within your line of site up to 100ft. If a creature is attempting to hide in that area, you have advantage on perception rolls to see them.