I credit this from Tina Small on UHALL sticky post "SA Loot/drops"
Items With No Known Use...Yet
Essence of Persistence - Skeletal Dragon mini-champ spawn in the Abyss. (Not sure yet where this loot drop goes. Stashing it here for now.)
Fey Wings - Fairy Dragons (Abyss)
Fur - Boura, Kepetch, and Kepetch Ambushers (overland Ter Mur). (Fur colors: Lowland Boura-light green; Ruddy Boura-reddish brown; Highplains Boura-yellow; Kepetch-dark green; Kepetch Ambushers-orange.)
Horn of Abyssal Inferno - Abyssal Inferno champ spawn (Abyss, Fel ruleset).
Kepetch Wax - Kepetch Ambusher (overland Ter Mur)
Lodestone - Cavern of the Discarded creatures (Abyss)
Primeval Lich Dust - Primeval Lich champ spawn (Abyss, Fel ruleset)
Slith Eye - Sliths (overland Ter Mur)
Vile Tentacles - Maddening Horror (Abyss)
Void Core - Void creatures (overland Ter Mur). Try the tougher ones, such as Vasanord and Anlorvaglem