The Endeavour is an Arcean Focail Class Aircuirassier based off the Valiant Class airforts. Like all aircuirassiers, it has less firepower and armour than it's airfortress equivalents. That being said, the Endeavour has the ability to counter any enemy airship. While it may not have the pure brawn of the Valiant class, it has the same brains in the form of unprecedented radar and fire control abilities. Also similar to the Valiant, increased attention was put into quick firing guns due to an increase in the amount of light aircraft being used as most of Arcea's opponents have turned away from trying to match their air navy.
Currently the Endeavour is serving alongside the Valiant in Ephesus.