So there is a hidden chest in Crota's end. It is at the Crota fight, and will guarantee an exotic weapon every time. I've gotten a gjallarhorn and an ice breaker this week. So you're probably wondering how to get this chest, right? Well, here we go: First, you need to spawn Crota. Once the shields in the starting room disappear, kill ALL the acolytes, but not the Knights. Once you kill the acolytes, go straight for the sword bearer. Take him out ASAP, then head straight to Crota. You will need to get seven sword hits on Crota as quickly as possible, before the ogres spawn. Once you get your seventh hit, immediately run down to where the sword bearer spawns (the door). Gather all six fire team members at the door. Now, hopefully you know that pulling out your Ghost next to one of those doors will open it. You will need to get all six people to face the door, and pull out their Ghosts at the same time. Now this next part is important: open the door. Get on the floor. Everybody walk the dinosaur.