I think the hardest part is farming for material. Omg I nearly lost my mind farming for helium filaments on the moon while doing sol edge. 3+ hrs. Good thing is I might never run out of helium filaments... Ever! The trick is, once u get a material, return to orbit and then back to farming. It give u the material in like after a maximum of 6 harvest. If u don't return to orbit I can assure u, the next material will be like in another 30-45mins. I started with the bolt caster, then the dark drinker and finally the Raze lighter. For some reason it skipped a whole lot of steps for the final sword. It went straight to solar ability kills and harvest material. I didn't need hadium flakes or crucible kills. Now am waiting for armsday to do the strike. For people who find it difficult to do the ability kills, I think it's because u don't know where to look for tons of enemies. Siege of the warmind is NOT the best place. It is an OK place if u need to kill about 50 enemies. But the exotic quest requires u kill atleast 200 enemies. If u have done the gjallahorn quest, then the best place where u can easily have up to 300 enemies coming at u is the part where your gjallahorn is being forged by your ghost in the mission "Beauty in Delivery". Stay in the room and the entrance will always be full with atleast 50 enemies. ALWAYS! Make sure after u kill the second captain, nuke your self and repeat and u will have any ability kills in under 15 in. As I said, u have a ton of enemies coming at u.