So last week I saw someone with blackhand wepon and i was like hm this looks cool I should go farm it. I didnt got the wepon but i got the other axe from the fire boss thats equaly sick if not better looking. So I went again this week and got the Blackhand wepon from heroic along with the full mythic set :). Also some how when I was selling all the trash after the run there was a mount in my inventory. I come to realize that the Last boss in blackrock foundry drops a mount and I didnt even realized. Today I googled a little bit more about the mount and it seems like this is one of the rarest drop mounts in the game if not the rarest. That is after BFA because in BFA it was 100% chance from mythic kills. Apperantely peopele are reporting 700 kills or more without drops on this mount making it wayy less then 1% chance drop. I somehow ultra lucked out on the 2nd try, but I wasnt even going for it… I didnt even knew he was droping a mount… Any way Ironhoof Destroyer matches perfectly with the full Mythic set and the Balckhand Mace on a Orc Warrrior 
It’s not the rarest thing in the game. They actually buffed the drop rate a little last year. But it’s still low like all other boss mounts, RNG could give it on the first shot or 500 attempts later. You just got pretty lucky!
Congratulations!
I thot so too. It makes no sens to be this rare. But yes I indeed lucked out ;). I was reading in reddit and ppl were making it sound like it was the holy grail of mounts. I know ashes from tbc is super rare and alllways thot its the rarest mount.
Yeah the rarest obtainable mount would have to be the Big Love Rocket. It’s coming up on Monday with Love is in the Air. Has a .03% drop chance per daily heart box and you can only try for it two weeks out of the year. If you have luck remaining then test it on that!
Thanks mate 