Yes, I was told it is a chest drop. I looted a Steel Golem Heart and it was a legendary chest drop. I was mentored at the time. So if CT golems are grey to you, it seems we will have to mentor to get these drops to compelte the quest. (You can use a steel heart as well for the Sanctum of Fear idols). I'm wondering if Azania's post is still accurate. The items are lore so you obviously will need 4 people, but what if two people each have 1 steel and 1 clay?