Module Y3 comprises a 100-page SSD book, including:
Early battleships for the Federation, Kzintis, and Gorns.
Warp-refitted command cruisers for the rest of the Federation member states before the unified star fleet was formed.
Warp-driven dreadnoughts for the five member species of the Inter-Stellar Concordium before they coalesced into one nation.
The 64-page rulebook includes five scenarios as well as the ship descriptions and annexes.