Gesserith, the Wileworm

Gesserith, the Wileworm is a Tyrant in Xenoblade Chronicles X. It is found in the South Silent Sandsea in Sylvalum during the fight with its mate, Atreides, the Distinguished.

Gesserith answers Atreides' call ten seconds after it reaches half health. It usually starts the battle by inflicting to distract the enemy from attacking its mate, and then both of them will use Maximum Charge to charge at the players and Massive Swing on enemies at close range.

Gesserith will often use Poison Gas to hurt grounded enemies. In addition, it uses powerful Arts like Bionic Bomb as well as Lightning Storm to inflict large amounts of damage over time.

Trivia

 * Gesserith is likely a reference to the Bene Gesserit in the novel Dune by Frank Herbert. The book describes gigantic worm-like creatures that burrow through sand, similar to the Sabula.