This item unlocks the hidden appearance called Prestige of the Amani for the Elemental shaman artifact, The Fist of Ra-den. It randomly drops from any of the rare elite spawns in The Underbelly of new Dalaran.
This item unlocks the hidden appearance called Ancient Brewkeeper for the Fu Zan, the Wanderer's Companion. It is looted from the keg that is unlocked at Tier 2, which gives the monk a random brew each day.
This item unlocks the hidden appearance called Bear's Fortitude for the Survival hunter artifact, Talonclaw. It drops from Ursoc in The Emerald Nightmare.
The first thing you'll need to do is obtain "Candrael's Charm" from a random drop - I assume it comes from Suramar guards, because that's where I got mine. No idea if that's the case. [Note: Other posts in the thread indicate that it is a zone drop.]
Once you have that, you'll notice the gem has "C.T." engraved on it. This stands for Candrael Twinshadow. If you go into the Felsoul Hold crater area in Suramar, there's a path visible on the map that runs west. Go up the incline and double-jump/glide along the rocks to get to the top of the cliffside. Follow it around to a large tree and you'll find Candrael Twinshadow, a Blood Elf Demon Hunter. She's by a large tree, some bird/porcupine mobs just before her.
If you show her the charm, her immediate reaction is to assume you're a thief and kick you off the side of the cliff - ya know, as you do. Her kick will send you straight at "Downfall," a large felbat with around 10 million health. You may've noticed him floating around in the general questing area. There's "violent winds" around him which will keep you aloft. You basically can "swim" in the spiral around him, but can't go too high or low or else you will drop out of the area and will reset (you can go to Candrael to continue attempting it). After damaging him for a little bit, Downfall will fling you off in a direction. You basically need to stay afloat using Glide and fall back on top of him to get kicked up by his winds again.
From my attempts (took around 5-10 to realize this was a DH only encounter and I had to be creative) it seems like you need to cancel Glide once you get back to his winds or it'll be buggy and let you fall right through. He'll fling you around again randomly even when you get back into his "bubble" of wind.
Kill him and you get the Guise of the Deathwalker.
This item unlocks the hidden appearance called Moonspirit for the Feral druid artifact, Fangs of Ashamane.
"No one has acquired it yet that we know of, but we have a lead on how to acquire it. Perhaps daily in the Emerald Dreamway you will see an emote in your chat log referencing a feral screech coming from one of the portals. Cross through that portal, look for the nearby moonstone, and touch it. You will receive a buff for 20 seconds, but no one has figured out what to do from that point on." (WoW forum post)
Equipping this item also automatically equips the off-hand, Fangs of Ashamane.
This is the brief cutscene that plays upon interacting with the Fangs of Ashamane (object) as part of the Feral druid-only scenario for obtaining the artifact daggers. I recommend shapeshifting out of feral form before picking up the daggers because the camera of the cutscene is otherwise not at the same level as you. :/
This item unlocks the hidden appearance called Frostfire Remembrance for the Frost mage artifact, Ebonchill. You must have the Teleportation Nexus talent unlocked for your class order hall, which unlocks a set of five portals. There is a low, daily chance that you will hear a sound and see an emote alerting you to hearing something come from the portals downstairs. Any of the five portals, at that point, will take you to a phased version of Frostfire Ridge. An NPC will give the item to you.
This item unlocks the hidden appearance called Fate's End for the Affliction warlock artifact, Ulthalesh, the Deadwind Harvester. It drops from Sataiel. The process of summoning the demon is somewhat involved and it will take most players a number of days to complete step 2.
This item unlocks the hidden appearance called did somebody say Thunderfury, Hallowed Blade of the Windlord for the Outlaw rogue artifact, The Dreadblades.
There is little information on how to obtain it, though it seems RNG will play a large part. A Chinese player looted the left half Bindings of the Windlord from Dargrul on Mythic-difficulty Neltharion's Lair. The source of the right half Bindings of the Windlord remains unknown. There is probably a quest that exists for turning in the items.
This item unlocks the hidden appearance called Titan's Reach for the Beast Mastery hunter artifact, Titanstrike. It is sold by Hobart Grapplehammer <Engineering Supplies> in new Dalaran for 8K gold. He is affiliated with the Kirin Tor faction, so faction price discount may apply.
This item unlocks a hidden appearance of the same name for the Shadow priest artifact, Xal'atath, Blade of the Black Empire. It can drop from Il'gynoth (any difficulty) inside The Emerald Nightmare raid instance.
This item unlocks a hidden appearance called Last Breath of the Worldbreaker for the Protection warrior off-hand artifact, Scale of the Earth-Warder.
It is looted from a shield that occasionally spawns in the upper floor of Neltharion's Vault, a large cavern, in Highmountain (coords: 25, 40). On the zone map, it is on the southern end of the land that sticks out into the water, or south of the label "Blind Marshlands." The closest flight point is the Obsidian Overlook.
If the shield is spawned, you will see the following emote: "You hear a strange roar from the cavern ahead." Prior to that, alpha/beta players were using a quest dump to check its spawn while also at the cavern.
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This item unlocks the hidden appearance called Prestige of the Amani for the Elemental shaman artifact, The Fist of Ra-den. It randomly drops from any of the rare elite spawns in The Underbelly of new Dalaran.
0
This item unlocks the hidden appearance called Ancient Brewkeeper for the Fu Zan, the Wanderer's Companion. It is looted from the keg that is unlocked at Tier 2, which gives the monk a random brew each day.
0
This item unlocks the hidden appearance called Bear's Fortitude for the Survival hunter artifact, Talonclaw. It drops from Ursoc in The Emerald Nightmare.
2
This item unlocks the hidden corruption called Corrupted Remembrance for the Retribution artifact, Ashbringer.
From MMO-Champion:
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Edit: There was another requirement added when Legion went live. Your demon hunter must now also have a minimum Artifact Knowledge of Rank 5.
This item unlocks the hidden appearance called Deathwalker for the Havoc demon hunter artifact, Twinblades of the Deceiver.
From Azarakel via MMO-Champion:
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Equipping this item also automatically equips the off-hand, Twinblades of the Deceiver.
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This item unlocks the hidden appearance called Moonspirit for the Feral druid artifact, Fangs of Ashamane.
"No one has acquired it yet that we know of, but we have a lead on how to acquire it. Perhaps daily in the Emerald Dreamway you will see an emote in your chat log referencing a feral screech coming from one of the portals. Cross through that portal, look for the nearby moonstone, and touch it. You will receive a buff for 20 seconds, but no one has figured out what to do from that point on." (WoW forum post)
Honestly, this seems stupidly convoluted and a time-sink in one of its purest forms going by the length and depth that Odrok has gone to. I quoted the one post here because the druids in that thread are still puzzling out the method of acquisition and it seems the best theory at this point.
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Equipping this item also automatically equips the off-hand, Fangs of Ashamane.
This is the brief cutscene that plays upon interacting with the Fangs of Ashamane (object) as part of the Feral druid-only scenario for obtaining the artifact daggers. I recommend shapeshifting out of feral form before picking up the daggers because the camera of the cutscene is otherwise not at the same level as you. :/
0
This item unlocks the hidden appearance called Frostfire Remembrance for the Frost mage artifact, Ebonchill. You must have the Teleportation Nexus talent unlocked for your class order hall, which unlocks a set of five portals. There is a low, daily chance that you will hear a sound and see an emote alerting you to hearing something come from the portals downstairs. Any of the five portals, at that point, will take you to a phased version of Frostfire Ridge. An NPC will give the item to you.
0
This item unlocks the hidden appearance called Fate's End for the Affliction warlock artifact, Ulthalesh, the Deadwind Harvester. It drops from Sataiel. The process of summoning the demon is somewhat involved and it will take most players a number of days to complete step 2.
2
This item unlocks the hidden appearance called
did somebody sayThunderfury, Hallowed Blade of the Windlord for the Outlaw rogue artifact, The Dreadblades.There is little information on how to obtain it, though it seems RNG will play a large part. A Chinese player looted the left half Bindings of the Windlord from Dargrul on Mythic-difficulty Neltharion's Lair. The source of the right half Bindings of the Windlord remains unknown. There is probably a quest that exists for turning in the items.
0
This item unlocks the hidden appearance called Titan's Reach for the Beast Mastery hunter artifact, Titanstrike. It is sold by Hobart Grapplehammer <Engineering Supplies> in new Dalaran for 8K gold. He is affiliated with the Kirin Tor faction, so faction price discount may apply.
It changes the weapon from a gun to a bow.
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This item unlocks a hidden artifact appearance called Serpent's Coil for the Restoration shaman artifact, Sharas'dal, Scepter of Tides. It has a chance to drop from Warlord Parjesh in the 5-man dungeon, Eye of Azshara.
0
This item unlocks a hidden appearance of the same name for the Shadow priest artifact, Xal'atath, Blade of the Black Empire. It can drop from Il'gynoth (any difficulty) inside The Emerald Nightmare raid instance.
0
This item unlocks a hidden appearance called Last Breath of the Worldbreaker for the Protection warrior off-hand artifact, Scale of the Earth-Warder.
It is looted from a shield that occasionally spawns in the upper floor of Neltharion's Vault, a large cavern, in Highmountain (coords: 25, 40). On the zone map, it is on the southern end of the land that sticks out into the water, or south of the label "Blind Marshlands." The closest flight point is the Obsidian Overlook.
If the shield is spawned, you will see the following emote: "You hear a strange roar from the cavern ahead." Prior to that, alpha/beta players were using a quest dump to check its spawn while also at the cavern.