Yggdrasil IV

The Yggdrasil IV is a large transformable vessel appearing in Xenogears.

Description
The Yggdrasil IV was a large scale landing assault vessel that was loaded onto the Eldridge. It is actually fundamentally unrelated to the rest of the Yggdrasil series, being named as such after being discovered by Bart. When the Eldridge crashed it was separated from its storage block and buried in the area of present day Nortune. It would be excavated by Roni Fatima and refurbished, then sealed in Nortune as a trump card in the war against Solaris. Of those left alive in the modern era only Queen Zephyr knew about it. When the Yggdrasil 3 was restructured, things were added to it to enable it to merge with the Yggdrasil IV. Through this it could be commanded by only 3 personnel. It was also set up to be able to separate easily in case of an emergency.

Originally meant for surface operations, the Yggdrasil IV was decided from when first discovered to be able to change into a Gear to enable smooth tactical land maneuvers. It is also known to be the size of Gears used on the planet the Eldridge embarked from. As a naval vessel one of its characteristics is that depending on the location it is loaded with small scale explosive weapons.

Analysis
For much of the game, the Yggdrasil IV remains dormant and acts as the Central Administrative District of Nortune. After discovering some ancient records, Bart activated it in order to fight back against the Solaris Mobile Surface Supremacy Weapon, Fort Hurricane which aimed to stop the signing of a peace agreement between Aveh and Kislev. Piloting the Yggdrasil IV himself, Bart is able to destroy Fort Hurricane.

Later in the game the Yggdrasil IV is used in an operation to destroy the cannon of Merkava. Utilizing the Excalibur as part of the mission, the Yggdrasil IV is successful, although it is destroyed as part of the mission.