This is the only thing that's really, really frustrating to me. In my journal I have the assemble quest which states I already have a part of 3 and a recipe.. but I do not. I loot the pool in the Epitaph.. regular items. No quest item. I make my way to the end of Oracle Colossus.. no quest item. I get a guild member to help me get through Grannus Colossus. No chest at the end. His deduction was perhaps I needed to loot a skeleton hanging from a rock wall or something.. but to be realistic here, this is a total mess. There shouldn't be this much confusion and frustration regarding the main quest.