Sentry Island

Archelon Fortress Sentry Island is the final battleground of Ace Combat X: Skies of Deception. It is home to Archelon Fortress and Fenrir, an advanced multirole superfighter built by Leasath.

Description
Sentry Island is mainly a small island with a mountain and military facilities jutting out of it. It almost resembles the island of Corregidor in the Philippines, a WWII fortress. Archelon Fortress houses a Shock Cannon, same as the one deployed on Gleipnir, and Fenrir, an expensive advanced multirole superfighter. The Fenrir was the cause of the Leasath-Aurelia War due to the massive funds required to build one.

Ending A
The Aurelian forces successfully defeated Leasath's elite Alect Squadron and denied them from reaching Archelon Fortress. As the Aurelian forces advanced closer to the fortress, Leasath introduced their new weapon, the Fenrir, equipped with the HPM Plasma Spheres. A battle ensued between Aurelian Forces and Leasath's remaining threat. As the air battle ended in Aurelian Victory, the base commander ordered the destruction of all Aurelian air units in the area using the Shock Cannon. The Gryphus Squadron, aided by friendly units, weaved through the bursts and destroyed the Shock Cannon. The Leasath-Aurelia War officially ended.

Ending B
The Alect Squadron managed to arrive at Archelon Fortress and pilot the Fenrir against the advancing Aurelian forces. An air battle ensued between the Alect and Aurelian forces, spearheaded by Gryphus 1. This diverted the attention of Leasath Forces from the Aurelian Amphibious Unit aiming to take the electric plant. As the unit reached the plant, they opened the plant gates so the waiting Gryphus 1 can disable the Digital Optical Stealth of Fenrir. After all Alect Fenrirs were destroyed, the ground units opened the fortress gate and found another Fenrir beginning to take off. Gryphus 1 proceeded into the fortress in pursuit of the remaining Fenrir, destroyed it, and exited the fortress. The war ended in Aurelian victory.