I ran like 20 of these damn things and i didnt get any exotic chest. Most of the time its just glimmer or the occasional core. shards and cores should be guaranteed drops as well as legendary gear. That way you don't feel like you wasted your time when it doesn't drop exotics. It ahould drop the exotics way more often because this lowass droprate sucks, how are we to farm the armor with the stats we want if the drops are like 1 in a -blam!- million. May change it to drop every other run or something cuz the rng is frustrating.
Rng isnt rng if the same thing happen over and over again its no longer a random instance. Also i get new exotic on first master run rarely second always first. Most of the time i get double exotic drops either from the chest or a random drop.