Being as we were just ranked, I suppose it's about time I got around to posting this... For those of you not sure of which items are used for the repeatable quests that give Etin for a reward, here they all are:
Arktuis QuestsEssence of Witch x2
Thin meats x2
Bromen Core x2
Huigronn StrongholdDark Mages Stone x2
Manitou Core x2
Golden Scissors x2
KeoSparkling Powder and Stable Core
Deadly Poisoned Essence and Desert Essence
Monster Poison Stinger and Desert Crystal
For more on where to find these items or any other questions you may have, you can probably find the info at -->this<-- link. Enjoy.