Easiest method and most used method: One person with a decent sniper rifle goes on boomer duty, does not deviate from that task. You only need to cover the ones on the left. One is designated sword duty the rest help kill the sword bearer and shoot crota when sword bearer is ready. When crota is in his starting position he's easiest to get to with this method. he will move from the start position to the right hand side after a minute or two. It's time enough to get a sword run in him. When attacking him with the sword you want to be moving towards him when hes about 10% shield depending on how fast your team is getting it down. You want to get at least 2 good hits, you can get more but if you're not timing it right play it safe because crota will 1 shot you regardless of how far away you are from him. The range of his sword is a joke. There's usually time to get him to his knee twice before the sword despawns. Then he moves to the right, continue to kill adds, leave sword bearer alive until he moves back to the centre. Once he does repeat the first steps then once you've done that move down to the original start position under the death singers room and stay there until the two ogres arrive. FYI crota will move to the left side at the point the same as he does to the right. Make sure you're not there when he does because he will kill you. Kill the ogres them start heading back to where you started. You can return via the right hand side or wait till crota goes back to the centre and go up the left steps. Bear in mind the thralls and cursed thralls will br in the crystal room and you'll need to clear them out. Once that's done and crota is back in his start position go back to step one and sword away until he's dead. He enrages after about 5 minutes I think, maybe longer. It's usually after the 4th sword run or so. Enrage is bad news so get him down before then. Ogres spawn after every 2 swords. Ogres must be killed or the sword bearer wont appear. Obviously when someone dies oversoul appears. That can be easily destroyed as long as everyone focuses on it. Hard is another matter but to be honest it's not much different apart from there being no chalice of light, 3 ogres spawning and a wizard appears instead of a sword knight along with the boomers. Crota also enrages around 20% hp regardless which sucks a bit. Oh and a very unhappy gatekeeper patrols the lower section.