Viridian WatchstoneThe memories and emotions of countless victims of the Elder, locked in stone for eternity.Socket this into a Citadel on your Atlas to increase the Tier of Maps and reveal hidden Maps in that Citadel's Region. You can only socket one Crimson, Viridian, Cobalt or Golden Watchstone into each Citadel.
Acquisition Not in game Drop level: 1Metadata Item class: Watchstone Metadata ID: Metadata/Items/AtlasUpgrades/AtlasRegionUpgrade3_7
It has the green border in-game, just like other quest item . However, sextant can be applied on the watchstone to allow the sextant mod show up on the watchstone. Players can swap the watchstones between atlas regions to store and optimize the sextant mod they want for that region.
Before the removal, it was a drop from Al-Hezmin, the Hunter by following The Hunter quest. There are total of 8 Viridian Watchstones that actually have different internal id, correspond to the 8 regions of the atlas.
From ver. 3.9 to 3.15, the 5th to 8th Viridian Watchstones require to socket 1 set of 4 Watchstones in a region that the player haven't obtain the Viridian Watchstones yet. This was changed in version 3.16.0 when the dev cut the atlas region from 8 to 4.