Here is some rng for us. Death singer I get no land beyond after finishing Crota I get red death. Both check points give a chance for exotic drops. Bother gave me exotics next raid what did I get from them two check points energy and shards and a helmet. So really it is all about a rng code Cuz at a certain point I think everything has a numbered assigned to it yes Ghorn probably has only 1 number and no land beyond or dragons breath may have 10 but they all have a number and the computer picks a random let's say 6 digit code and it matches that code up with what ever is on the loot table.