Marsanes

The Marsanes is the warship of in Xenoblade Chronicles 2. It serves as their headquarters and is shown to be able to hold its own against one of Alrest's major Titans. Much like the, the ship does not use a Titan at its core and is entirely mechanical.

Chapter 4
The interior of the Marsanes is first seen when Jin walks around the ship and looks at the frozen body of Lora.

Chapter 5
The interior of the ship is seen another time, when Jin and Malos look at the many Core Crystals stored on the ship.

Chapter 6
Jin is seen inside a regeneration device installed in the ship, coming out of it with Malos nearby. The two discuss Jin's condition and the promise they made.

Chapter 7
The interior of the Marsanes is seen multiple times during the chapter. The control room is seen twice, first when Malos and Akhos discuss Pyra's attempt to kill herself, and another time when Patroka and Akhos talk about Malos's ability as the Master Blade. Mikhail is seen working in the room with Lora's frozen body, with Patroka interrupting him and asking what he is doing. He replies, stating that he is preparing the ship for battle against "non-mortal opponents".

Chapter 8
Jin once again awakens in the Marsanes's regeneration device, before Malos remarks that he could have gotten better treatment if Judicium hadn't been destroyed. While ascending the World Tree aboard the Marsanes, Torna comes under attack by the Indoline Praetorium, both by the Indoline Titan itself, and the Indoline army. In response, they fire the warship's weapons at the many Titans attacking them and release their own army of artificial Blades, the Blade Bots.

While the battle goes on, Amalthus tries to use Mythra's power and control Siren to bring down Torna, successfully hitting the Marsanes. Back inside the ship, Mikhail announces to Jin and Malos that they have reached the boundary layer, the height limit at which the ship can go, prompting them both to disembark on the World Tree. Amalthus forces Mythra to shoot another beam of light toward the ship, though she is able to resist, leading to the beam missing the Marsanes.

Chapter 9
After Amalthus summons both Mor Ardain and Uraya, Mikhail tells Akhos and Patroka to follow Jin and Malos inside the World Tree, which they do, before initiating the ship's transformation into a humanoid, Titan-like mech, initiating battle with the Indoline Titan directly.

The Ardainian Titan fires a beam toward the Marsanes, which the ship blocks with a ball of energy from its palm. Annoyed by the Titan's interruption in his fight with Indol, Mikhail fires a beam of his own from the Marsanes's right hand, hitting Mor Ardain across its body. Afterward, Amalthus attempts to weaken Mikhail with his powers, failing to do so due to the latter being a Blade Eater as well.

As the Marsanes resumes the fight, punching away at the Titan, Mikhail is once again interrupted as the warship is attacked from behind by a newly arrived Genbu. After Rex and {{Pneuma]], propelled by Poppi, successfully take down the Praetorium's amplification towers and free the Titans from Amalthus's control, Mikhail uses the Marsanes to intercept Indol's retaliation toward the party. After urging them to chase after Jin and Malos, Mikhail returns to his fight, slamming Indol into the World Tree, prompting Amalthus to fire a beam at point blank from the Titan's mouth in desperation. The Marsanes explodes after the hit, taking down the Indoline Titan at the same time, which sinks below the Cloud Sea.

Lore

 * Charlet talks about the Kingdom of Torna building a "powerful cutting-edge warship", precising that it is nearly done, most likely referring to the Marsanes.

Trivia

 * Mikhail describes the Marsanes as the "last Tornan warship". Both meanings of "last" are true in this description, as it is both the only remaining Tornan warship in Alrest at the time and the last warship that was constructed by the Kingdom of Torna.