Using Printed Starship Stat Blocks
The Starfinder RPG presents stat blocks for enemy starships and starship-sized creatures throughout various publications, among them the Alien Archives, the Starship Operations Manual, dozens of Adventure Path volumes, and other sources. A GM can use those stat blocks in narrative starship combat with some adjustments, tweaking starships of similar tiers to make each encounter unique.
Step 1—Determine the DCs: Compare the stat block’s tier to its armor and defensive systems. If the mark number of one of those systems is equal to or greater than the tier, consider adding 1 or 2 to the DCs as calculated for the starship’s tier. If the mark number of one of those systems is less than half of the tier, consider subtracting 1 or 2 from the DCs.
Step 2—Determine HP: In this system, most starships have 5 HP. If the starship is Tiny or an encounter uses more than a few starships to provide a challenge, reduce HP by 1. If the starship is Gargantuan or larger, add an additional HP.
Step 3—Determine Threshold: A starship with no, basic, or light shields has a threshold of 2. A starship with medium shields has a threshold of 3. A starship with heavy or superior shields has a threshold of 4. If the stat block doesn’t specify the category of shields the vessel has, default to a threshold of 3.
Step 4—Determine Skill Bonus: Use the second-highest skill bonus listed (adjusting for any modifiers from the ship’s handling and so on) from the stat block’s Crew section, not counting the gunnery bonus. If only one applicable bonus is listed, use that bonus –3 for the ship’s skill bonus.
Step 5—Consider any Special Abilities: Some stat blocks (especially those of starship-sized creatures) feature interesting special abilities, and simply ignoring them could cause the starship to lose what makes it special. Some special abilities can be used as written as the foe’s tactic for the round, while others require more adjustment. Compare the special ability to the listed tactics, and tweak it to allow it to work within narrative starship combat.
Source
Starfinder Enhanced pg. 176