My buddy and i have done 55 clears of zulmak (+/-1) over the past month to try and get the "Bane of Tyrants" ship to drop from him so we can finish the collections for Shadowkeep and get the Harbinger title. But this ship is just refusing to drop, and we thought it was supposed to be a guaranteed drop after, like, 40 clears. (We did the math with the percentage multiplyer after every clear and it came out to 40 clears.) Are we doing something wrong? Is this ship just broken?? Some help would be appreciated.