Ophion

Artifice Ophion or Ophion is an Artifice in Xenoblade Chronicles 2 and Torna ~ The Golden Country and a in the former. Unlike other Artifices, Ophion can be only be controlled with the Omega Fetter.

Appearance
Unlike other Artifices, Ophion is has serpentine appearance, and its head is organic with six protrusions that are placed in a hexagonal manner around the center. On top of its head is another humanoid body with a single glowing red eye, but unlike other humanoid Artifices, lacks the Aegis shaped crystal on its chest and instead features a spherical core.

Story
At the conclusion of the Aegis War, during the party's final confrontation with Malos at Soaring Rostrum, Mythra summons Ophion to fend off Malos's Gargoyles. Malos however anticipated this and hid several Gargoyles in the Cloud Sea which overwhelms Ophion and destroys it, causing it to sink into the Cloud Sea.

At some point, Ophion was revived and is tasked in guarding the World Tree from travelers. To this end it carved the Great Void around the World Tree.

When Rex's party attempts to reach the World Tree by borrowing Umon's boat, Ophion attacks them without warning, with Pyra recognizing it. Rex manages to gain enough distance to avoid its attack, causing Ophion to retreat back into Cloud Sea. The party is then swallowed by the Urayan Titan.

After manages to take both the Omega Fetter, and Pyra in Tantal, at Gotrock Oracle Ruins, after Malos restores his powers, he calls forth Ophion using the Omega Fetter, which he promptly reprograms to follow his will.

After Rex and Pneuma defeats Jin, Malos summons Ophion to destroy the party, only for Siren to intervene. Enraged, Malos orders Ophion to attack Siren in retaliation. Eventually Ophion manages to pin Siren into a cliff and fires a destructive beam, with resulting explosion apparently destroying Ophion, as well as a portion of Gotrock Oracle Ruins, sending Jin and the party plummeting into the Land of Morytha. With Ophion gone, the Great Void begins to disappear.

As an enemy

 * Artifice Ophion (Gotrock Oracle Ruins)