Balance / Scythe of Elune Hidden AppearanceThe Hidden Artifact Weapon Appearance for the Scythe of Elune is called Sunkeeper's Reach, and is unlocked by using the item called The Sunbloom. In order to get this item, you need to combine two other items, the Seed of Solar Fire and the Pure Drop of Shaladrassil's Sap.
The Seed of Solar Fire can be purchased from Sylvia Hartshorn in Val'sharah once you are exalted with the Dreamweavers. It costs 2 000 gold, so it's not that expensive. If you still need reputation with the Dreamweavers, check out this rep guide.
The Pure Drop of Shaladrassil's Sap is dropped from Archdruid Glaidalis in Dartkheart Thicket.To get the drop, you need Artifact Knowledge level 5, and be exalted with the Dreamweavers (it is unknown if having purchased the Seed of Solar Fire is a requirement go get it to drop). It only has a small chance to drop it, and it can drop on any difficulty, even normal.The best way to get it is to chainrun normal runs until it drops, or just queue for a heroic version every day.
Feral / Fangs of Ashamane Hidden AppearanceThe Hidden Artifact Weapon Appearance for the Fangs of Ashamane is called Moonspirit, and can be unlocked by using the item called Feather of the Moonspirit.
In order to get this item, you need to have an Artifact Knowledge of level 4+, and once you have that, you will begin to hear screeches from the different portals in the Dreamway. Now you must use the portals which screeches at you and locate an Owlcat statue. These are all hidden in the area right next to the portals. Finding one might take some searching, but most people will probably find them within a few minutes.
|This is what the Owlcat statue looks like on live servers.|
Note that you can only find one statue each day, and every day you will have a small chance to roll the "quest" that spawns the screech. This means that is mostly takes a lot longer than 3 days to get all statues, since you can be really unlucky with the rolls on the screeches, so it might take a week or two to get all three. (I personally spend about 2 weeks before I got all the emotes).
Once you have clicked on all the stones, 3 in total, an NPC named Ela'Lothen will spawn in the Dreamway. Now simply /sit in front of him, and you will get the Feather of the Moonspirit. Right click on this, and you have your hidden artifact appearance!
|Ela'Lothen in The Dreamway. He will disappear once you get the Hidden Artifact Skin.|
Guardian / Claws of Ursoc Hidden AppearanceThe Hidden Artifact Weapon Appearance for the Claws of Ursoc is called Mark of the Glade Guardian, and can be unlocked by using the item called Mark of the Glade Guardian.
This item is a drop from the raid boss Ursoc in The Emerald Nightmare raid. The drop chance is pretty rare, so don't expect to get it on the first few kills. It can be looted in both normal, heroic and LFR difficulties, and the item itself it tradeable. It is also possible to loot it even if you are not in a guardian specc.
The best way to get it is simply to run LFR along with any of the other difficulties every single week until it drops. Good luck!
Restoration / G'Hanir, the Mother Tree Hidden AppearanceThe Hidden Artifact Weapon Appearance for the G'Hanir, the Mother Tree is called Warden's Crown, and can be unlocked by using the item called Acron of the Endless.
To get your hands on this item, you need to choose the Evergreen Order Hall Talent. This allows to have two plots of land where you can farm items. You can click on these to plant a random seed, and after three days you can loot it. The Acron of the Endless is a random drop from these plots, so if you don't get it right away, you should replant and harvest these every three days until you get one.
It will take a long time to get it unless you are really lucky, so keep checking back every third day! You also get a few pets, some consumables and a nice speed boost trinket from these plots, so it's not entirely useless to farm this item.