Guild Wars 2

According to the DB site there are 6 named backpieces, judging by their names they should drop from the 6 dungeon paths that do not have a jewel recipe tied to them.

Arbor’s Embrace
Burntclaw’s Brace
Ghost Eater’s Hide
Prototype Sheath
Spineguard of the North
Wraithlord Chains

Due the stupidly infinitesimal droprate of those recipes though, this is all speculation.
Moreover for each of those there is a recipe entry like this

Does anyone have any reliable info? I’d like to have some since, even if they have the recipes droprate, they aren’t exactly “farmable”.

I’m expecially interested in the first one, since there is no exotic or ascended back piece with healing power as a primary stat apart from the stupidly bind-on-account, unobtainable in a finite amount of time Magi’s Spineguard exotic version.

UPDATE: thanks to informations from people that have dropped the jewel recipes, I can now infer the drop location of all the backpieces:

Arbor’s Embrace TA:fw->up (from Vivena)
Burntclaw’s Brace CoE 3 (Rhiannon path)
Ghost Eater’s Hide AC 3 (Detha path)
Prototype Sheath CoE (don’t know wich path)
Spineguard of the North CM 1 (Asura)
Wraithlord Chains Arah 3 (Forgotten path)

So far the only confirmed drop is the AC one, they “should” all come from path last boss (don’t know it either the boss or the chest) apart from TA where the jewel recipe all drop from the second last boss (Fyonna, Leurent) since you always have the Nightmare Tree at the end.

Couldn’t pinpoint wich CoE path the backpiece should come from, since there is Subject Alpha everywhere and the jewel names do not help:

Alpha Conduit
Infinity Loop

The sheath drops from Subject Alpha final in CoE path 3, at least I got one from there.

Unfortunately its an account bound item and not of my stat preference, nor does it appear to have any graphic of its own.