Warships

Warships can be added to your carriers to increase their fighting power.

Acquisition
They are built in their respective docks.

Upgrades
Warships can be upgraded with mastery upgrades once they are built. Higher tier ships are unlocked during base progression which can replace the low-level warships.

Types
Warships are divided in three types: Battleship (red), cruiser (green), destroyer (yellow). The types follow a classic rock–paper–scissors concept: Every type is strong against one of the others and weak against another:

Battleship -> good vs. Destroyer Destroyer -> good vs. Cruiser Cruiser -> good vs. Battleship

Just remember "traffic light": Red -> Yellow -> Green.