There’s a Theory that the very name, the ‘Titans’, is a clue to the Shadowlands.
The Greek Titans were the children of Uranus (yes yes, snicker away, I did too), the ‘Heavens’, and Gaea, the ‘Earth’. Uranus would eventually become sickened and disgusted with his children and, depending upon both the translation of, and the author of, the particular version you get, either ate several of them or hid them away inside Gaea’s physical body to the point Gaea became so distraught and disgusted with Uranus that she made her youngest son, an adamantite sickle which he then used to ambush and castrate his own father and, after that, went on to lead the Titans before his own son, Zeus, would begin a ten-year war against the Titans, pitting the ‘Old’ Gods against the ‘New’ ones.
In the aftermath of this, the ‘Old’ Gods, or at least those who refused to stop fighting or whom had grievously wronged the ‘New’ Gods, were shackled deep in Tartarus for their sins, an ironic echo of the very acts that supposedly spurred Gaea to turn against her husband in defence of her children, many of whom now were imprisoned anyways by their children.
And historically, the Greek Titans were often considered the ‘Gods in the Underworld’, versus the Greek Pantheon who were often considered the ‘Gods of the Heavens’ in addition to their other portfolios and duties, in-between screwing each other, and the mortals, over for the sake of their egoes.
It may be that Sargeras was very, very aware of the Jailor and openly refused to allow the Dreadlords any access to the Shadowlands and the knowledge therein because he was afraid that without the rest of the Pantheon, as we saw him gathering from various alternate timelines where their essences hadn’t been scattered across the universe during their cataclysmic final battle, to rebuild the Titans in his twisted image, because even with the Legion itself, and draining Argus to ‘cheat’ the rules of the Fel, an unleashed Jailor could have been capable of single-handedly wiping the floor with Sargeras and his demonic army if allowed to escape his prison.
Remember, the Chronicles is a ‘biased narrator’, giving us only the Titans’ view on history and, naturally, omits the facts that they would find inconvenient or that they themselves are not aware of.
And there were twelve Titans, six males, six females, three Cyclopes, and three ‘Hundred Hand Giants’, born of Uranus and Gaea, in total. That could mean that we’ve only seen a little over half of the Pantheon, but the ratio also doesn’t add up. We’ve seen seven Male Titans but only one Female Titan, so it could be that there’s a mix of ‘generations’ going on, and that the remaining women of the Titan Pantheon are still out there and in hiding from Sargeras.
Assuming the Greek angle still holds, that could also mean there’s one or two ‘Cyclopes’ and ‘Hundred Handed Giants’ hiding out in the Multiverse, and considering the historical abilities of both of these beings, they’re going to be absolutely deadly if they set themselves against Azeroth, especially the Cyclopes who were Zeus’s own forgers and weapon-smiths, and may be, in WoW at least, responsible for controlling and maintaining the Forge-Worlds that produce the Titan Watchers and Titan Facilities that we’ve met and dealt with thus far.
But going back to the Uranus-Jailor angle, the Titans were shackled into the Underworld after their defeat by the Greek Pantheon. Assuming the above still holds true, that could mean that the Titan Pantheon bound their creator into the Shadowlands to separate him from the source of his powers (The ‘Heavens’, which could possibly be the Light itself?) and hopefully keep him weak enough to remain imprisoned, at least until we ‘broke’ the Machine of Death and allowed the Maw to start funnelling enough souls/anima into the Jailor to allow him to brute-force his way out of the Shadowlands and re-take the universe now that his treacherous ‘children’ are busy playing the most awkwardly belligerent intervention with Sargeras.
It also opens up a rather interesting angle that, if Blizzard did plunder the Greek mythology for inspiration, if the Jailor is Uranus, who is their Gaea analogue?
But on to Bolvar.
Remember, Bolvar was a Paladin of great faith and power. He was then seared by the flames of the Lifebinder, which are capable of killing things but also bring forth new life from those ashes, and tainted by the Blight, an alchemical agent of both Undeath and destruction, and then turned into an Undead and eventually crowned with the Helm of Domination by a Paladin wielding the Ashbringer, which contained the core of a Naaru, a being of ‘perfect’ Light. The Helm of Domination itself an artifact from the Shadowlands that holds a deep connection to both that realm, has been touched by the Legion and the essence of the Fel, stolen by the Nathrezim, Demons who once served the Old Gods and had a deep knowledge of the Shadow/Void, and this artifact was capable of uniting many minds into one under the will of the one who wore it.
Bolvar has basically out-Med’an’d Med’an. There is a lot of Primal Forces being brought to bear on a single target here, and the only one not included into the mix was Arcane. I think that’s going to be rather telling as the Shadowlands plays out…
And Sylvanas broke that artifact like it was wet paper bag, presumably with power granted to her by the Jailor.
We need to remember that the Titans are not good beings. They effectively magically castrated the Dragonflights once they triggered certain events, they’ve completely destroyed and remade worlds inhabited by sentient beings simply because they didn’t ‘measure up’ to the Titans’ designs, and we have yet to know the full extent of their ambitions and designs on the Multiverse, especially since our only sources are information are biased, or trying to murder us all. The Titans betraying the ones who helped imprison the Jailor and also trapping them in the Shadowlands seems pretty consistent with their MO.
I do think that the Jailor is going to be an entity that we have to keep sealed up, that if he’s ever allowed out, everything ends, that he’s not just a prisoner, he’s an anchor, he’s being used to hold down reality as we know it via the Machine of Death, and he’s the being that Odyn, being the magnificent prat that he is, made the foolish bargain with for one of his eyes for the knowledge of the Shadowlands. If the Jailor breaks free, the rest of the Titans’ works will start to unravel and we could see a ‘Titan vs Progenitor’, or ‘First Ones’ as the Shadowlands Leaks have revealed to us, war with Sargeras being loosed and tentatively working alongside the Titans, and us working alongside the Legion, to fight back against this released and re-invigorated ‘Uranus’-type character, who then sets about freeing and unleashing his imprisoned siblings across the Multiverse, and we see the very laws of reality being deformed and twisted as Titans and First Ones clash, warping the very laws of physics to lash out at one another.