From publisher blurb:
Battle for the Planets!
There's more to interplanetary warfare than heroes battling monsters and small ship-to-ship skirmishes, and Star Battles provides a massive expansion to the basic rules provided in the Starfinder Roleplaying Game! Explore new character options for commanders, dog-fighters, and jury-riggers, and ship-focused spells and feats! Equip entire armies and battle squadrons with unit-level equipment, mass combat tactics, command boons, and special abilities! Conduct planet-side sieges and infiltration, bombardment and blockade, using the troop template to create your own armies to work alongside your heroes in standard Starfinder play or integrate with the best-selling Star Empires expansion from Legendary Games. Spaceship enthusiasts can connect the planetary action with star-spanning space fleets as well with layered mass combat rules, or can simply use this book as a huge cyclopedia of new ship options, including armor upgrades, new weapon properties, security and sensors, expansion bays, damage control, defensive countermeasures, hull types, crew rules and actions, ship stunts, and so much more! Plus nearly 20 ready-to-use pregenerated armies and fleets like the enhanced special ops, destroyer battalion, orbital command platform, and planetrazer cannon to declare your own intergalactic war! Launch plague missiles and orbital rays at your enemies, hide your secrets with divinatory shielding, make travel easy with teleportation bays, and unleash your wrath with the vesk hullcracker ram. Get ready to spend your hard-won credits, strap into the captain’s chair, and jump into Star Battles!