Just a thought: Everything that takes place after the Commander gets shot with a flaming arrow (representing Primordus) is part of an elaborate dream sequence through which Jormag subtlely converts the Commander to their side. When the Commander awakens, Aurene even acknowledges that the Commander has been having "fitful dreams".
There's a bigger possible message here, though. Aurene talks about Jormag's "vague warnings" that aren't specific enough to reveal anything. Moreover, the episodes, especially during the DRMs, involve language and events that keep reminding me of water. At Rata Sum, destroyers come out of the water. NPCs fight a destroyer with an especially hard shell and must find a way to penetrate it's armour. They also describe destroyers as "flooding in". There are other instances too, but I'm on my phone and this is a mission so I'll skip an exhaustive list of examples.
So, why is Jormag doing this? Well, it's fair to say that Primordus is acting as a proxy for...you guessed it: the Deep Sea Dragon. But why doesn't Jormag just plainly tell Aurene and the Commander about the DSD, or say it's name?
Here's the idea: For some reason, discussing these things plainly is too dangerous for the ears of mortals, even Aurene, to hear. To reveal the DSD's malevolence, Jormag must be subtle so as to prevent further destabilising the Elder Draconic Cycle.