"Rebellion" introduces fast-attack corvettes and super-heavy titans, in addition to the aforementioned new capital ship class. Each of the six factions of "Rebellion" has its own unique class of corvette and titan. Corvettes are smaller, faster and weaker than regular frigates, and have different special abilities depending on the faction. Titans, by contrast, are extremely powerful and expensive, much larger than any other vessels, and capable of being leveled-up like capital ships. Only one titan can be maintained by a player at any one time. Each titan possesses unique, upgradeable abilities that can reinforce friendly fleets or weaken enemies. In addition, titan levels are persistent—if a level 10 titan is destroyed in battle, it can be rebuilt (at a significant cost) at level 10, without requiring it to repeat the leveling process.