Been running a lot of heroic instances, since I got access, and haven't seen one yet. It is frustrating to have a faction merchant when you have no idea where to get the item he wants to allow you to purchase his items.
I got one from the chelsith heroic a couple days ago and another last night out of temple of the faceless heroic. Seems that only those who finished the signature line can see them in the chests same as the Obol coins
I've cleared eight instances and I've seen one drop (HEx2, DCx3, ToFx2, ST). It came off a trash mob in the new ST Heroic. I also got the Essence of Baelon off Baelon. 1 out of 4 clears giving one item is not gonna cut it I don't think.
Seen two drop in about 20 heroic zone runs. Waaaay too rare to be the end currency. They need to at least be guaranteed one per zone, if not one per person per zone (like doze heads, hint hint)
It looks like any of the named in the heroic CoE zones can drop one... the other items seem to drop only off one of the last named in each zone (you can guess from the item name and description)
I have been running ST(heroic) trying to get The Forgotten Statue essence with no luck. i heard a rumor that you have to have your cloak running can anyone comfirm this? But i agree the drop rate is dumb b/c i also been farming the ST contested for the Essence off the drake on the 3rd floor with no luck. I just want a nice ring with a green slot before i get a raid one and never run heroic stuff again.