Guardian's Amulet 2049since 0.152.55 20 changes removed in 8.2.1
800g (400g base, 320g sell)
Active — UNIQUE Active - Warding: Consumes a charge to place a Stealth Ward that reveals the surrounding area for 150 seconds. Holds up to 3 charges which refill upon visiting the shop.
(A player may only have 3 Stealth Wards on the map at one time. Unique Passives with the same name don't stack.)
Builds from: 
Ruby Crystal
Builds into: 
Ruby Sightstone
Eye of the Watchers
Eye of the Oasis
Eye of the Equinox
ActiveHealthVision
Click any two patches to compare; the current range is shaded.
− Restores 10 Mana every 5 seconds. If you can't gain mana, restores 3 Health instead.
+ Restores 10 Mana every 5 seconds. If you can't gain mana, restores 0.6 Health instead.
− Restores 10 Mana every 5 seconds. If you can't gain mana, restores 0.6 Health instead.
+ Restores 10 Mana every 5 seconds. If you can't gain mana, restores 3 Health instead.