I just got an "Aspect of Glass" ship, an Atheon's Epilogue, and FINALLY got a Vex Mythoclast from VoG (Hard, of course, because of the Mythoclast).I just wanted to let players know a tip (that a few people already know). You have a WAY bigger chance of getting a Mythoclast if you beat Atheon Hard FLAWLESS. This means no wipes. If you want to, you can go to orbit and back to the raid with your team to reset your deaths. I hope this helps.
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I got it on my first run I stopped playing a month after launch since my house was getting renovated and only started to play again a week or so after the 1st expansion came out So I never bothered with the vault of glass just started crota. But did vault of glass on hard for the first time ( before I even did it on normal) and got it. It's just pure random and luck doesn't matter is you have wipes or not to be honest