A Hunt Like No Other

So it turns out that Vaults are scattered all over the galaxy. But what about Pandora? Had the planet run out of Vaults to open? Of course not. But have you ever wondered why the Eridians tried so hard to hide them? Well, the general idea is that some Vaults... should have never seen the light of day. And for good reason. Triple crossover (RWBY, Borderlands and Doom).