I like the Hive Throne World theory- that the Vault of Glass may be an attempt to replicate one, and an idea popped into my head last night reading some stuff and thinking about the Vault of Glass. The Fanatics in the Templar's Well- these are Vex enemies that we only encounter in the Vault, and there's a few interesting things about them. They appear to be infected or corrupted Vex units. If you look at them closely, they emit a green gaseous substance that looks similar or the same as the substance fuming from Bad Juju. They rush you and explode in proximity, much like a Cursed Thrall- they are a Goblin, the base unit of the Vex, and Thrall are the base unit of the Hive. When killed or when they self-detonate, they drop a pool of green liquid on the ground, and if you touch it, it gives you a debuff "marked for negation" that has paracausal power, which is something the Vex may have gained knowledge of from The Hive. They also do not / cannot sacrifice themselves to the confluxes, which may suggest further that they are not wholly Vex, or pure enough to be a proper sacrifice... but what are they infected or corrupted by? Could it be The Hive? There is one other Fanatic present in the game, The Fanatic of Crota. My speculation as to how the Vex (Fanatics specifically) could be infected by the Hive is through their interactions with Hive Throne Worlds. This is all speculation, but I found the multiple connections/similarities interesting. Edit / copypasta a reply regarding Hive/Vex interactions prior to our timeline: [quote]In the Books of Sorrow, Crota cuts a hole in space/time and the Vex enter Oryx's Throne World (this is a long time before our game's timeline). Starting [url=http://www.ishtar-collective.net/cards/xxxviii-the-partition-of-death]here[/url], the story of Vex in a throne world goes on for a few cards.[/quote] Edit for correction per VincibleInk424's reply: [quote]It is not simulated, simulated means run on a computer. The vault could be a replication throne world or a synthetic one but not a simulated throne world because guardians cannot be simulated and we enter the vault.[/quote]