One of the things that struck me with HoT was how passive Mordremoth was presented to be. Most of his actions appear to be reactive rather than active. Canach notes that Mordremoth likes surprises but ultimately Mordremoth isn’t shown to actually do a lot. As the Elder Dragon whose sphere includes Mind I’d have chalked Mordremoth up as something of a schemer, which would fit in with Canach’s description of him. This disparity between how Mordremoth is described and what we see of his actions could be explained away as poor writing, but for once, I don’t think that’s actually the case. I think Mordremoth had a game plan and came dangerously close to pulling it off.
The first part of the plan happened in LS2 where Mordremoth attacked Camp Resolve and pressured Trahearne to assault the Maguuma. If you speak to Trahearne in that instance after the attack he’ll comment that he thinks if they don’t launch the attack soon they’re not going to have another chance. This puts the Pact in the position of either waiting for Mordremoth to get his ducks in a row and overwhelm them or attacking into Maguuma. And we saw the result of taking the fight into the Maguuma, Mordremoth’s ambush, the Pact fleet destroyed, the Call, boatloads of corpses for blighting trees and the capture of Trahearne. I don’t think this was dumb luck on Mordremoth’s part but rather a planned development.
The capture of Trahearne here is something that I also think was a planned move. Mordremoth treats Trahearne with a special degree of attention and care, even going so far as to essentially turn Trahearne into a horcrux. From what we know of Elder Dragons, they shouldn’t care that much about any single baseline minion. You could argue that Trahearne was a special case given his standing as the firstborn of the Firstborn sylvari and therefore it was a question of status, but I still don’t think that’s the reason.
I think the reason Mordremoth placed so much focus on Trahearne has to do with Caladbolg. Trahearne mentions that he’s connected to Caladbolg. Which is interesting considering we’ve seen what happens to other people when they are affected by a powerful dragon artifact. Kellach is corrupted by Zhaitan’s power essentially becoming a cursed Risen magnet and Steag is corrupted by Jormag’s Sanguinary Blade becoming an icebrood. Yet we also see Zephyrites using Zephyrite crystals which are dragon artifacts from Glint with no real adverse effects. From this we can infer that it’s not necessarily dragon magic nor dragon artifacts that are inherently dangerous, but rather the individual dragons they are connected to. From this I’m led to believe that dragon artifacts act as conduits for the dragon’s power and influence. After all, how could a sword make the decision to corrupt someone and if dragon magic itself isn’t inherently corruptive then what we have left is the individual dragon exerting their influence and desire to corrupt and control.
If my view here is correct, then what Trahearne essentially has in Caladbolg is a conduit to the Pale Tree’s power and influence. If Mordremoth can corrupt Trahearne, I believe Mordremoth can use Trahearne’s connection to Caladbolg to assault the Pale Tree and attempt to corrupt her. In her weakened state I don’t believe that the Pale Tree would be able to offer much resistance. The corruption of the Pale Tree would then ultimately be leveraged against Sylvari beyond the Maguuma and used to corrupt them as well. This would have given Mordremoth a new army of Mordrem Guard, a powerful Dragon Champion who doubles as a blighting tree and access to an Asura Gate that leads right into an Asura Gate hub in the heart of Lion’s Arch which would lead to a situation akin to the Central Transfer Chamber being captured by Destroyers.
This would allow Mordremoth to open a widescale fronts essentially anywhere while the Pact is grounded, mired and fighting for survival far to the west in the Maguuma wilds. If Mordremoth had not been stopped by the Commander this would have been a game over situation.
This is, of course, mostly speculation and theory but it does neatly answer questions like why Mordremoth was so focused on Trahearne and why it seemed like Mordremoth wasn’t doing much of anything overtly. Please let me know what you think.