Necrocasm isn't hard to get its time consuming and requires luck since you get one chance per week to get the crux and if you don't then you gotta wait. The grinds with the husk and eidolon ally are also exactly that. A grind but not hard. Outbreak prime was the hardest for me not because beating the raid was all that hard since especially now that hard mode is out to compare it to, its really easy. finding a warlock at the checkpoints was way harder. Then the good old Jolly Holliday quest, a possible nightmare for strict pve'ers such as myself right? Not exactly. Even someone like me who hovers around the .8-.9 completed the so called hardest part of this quest in about 8-9 games. Finally comes the only other exotic(s) i think is worth mentioning here, the swords. The quest was again another stupid massive grind and doing all three in close time proximity was suicide especially if you were the uneducated fool using a titan to get dark drinker. But the last strike mission for me was the hardest thing to do If and only if you went for all three since the matchmade team you were with had all the different ones. Just two was fine. Even if one of those two was Adleg (-blam!- Adleg) but all three plus the thrall and alak hul at 320-330 light was not fun. Made worse when your team died a lot. I'm conclusion 1. All three swords at once 2. Outbreak prime finding a warlock Everything else it doesn't matter what order