Starfinder GM Core

The lore chapter alone justified the purchase for me; I've already pulled two NPC factions straight into my ongoing campaign. Rules options are laid out clearly enough that I barely had to flip back and forth mid-session.

The encounter design tools are incredibly thorough, making it easy to balance fights for my group. The expanded rules on starship combat finally clicked for my players.

The lore section alone is worth the price, giving me tons of adventure hooks right from session one. Our group is already using the new options to spice up encounters.