In Search of the Sun Blade

In Search of the Sunblade is an adventure that's designed to allow a group of Pathfinder Roleplaying Game characters to jump directly into the Starfinder Roleplaying Game.
While this adventure is written using the Pathfinder Roleplaying Game ruleset, it makes mention of certain rules that are exclusive to the Starfinder Roleplaying Game.

In the wake of a dark Necromancer’s assault, wherein all life was destroyed or corrupted in the lands under his control, the guardian Diviners have become desperate and seek the PCs help in a final ploy to defeat the Necromancer.
When a bright ball of fire streaked a flame across the sky, directly into the Necromancer’s domain not three days past, the Diviners saw just one phrase: “Otherworldiness binds the iron that embraces the light of stars, resting where majestic Life-to-Death did go.” The Diviners sense an energy deep within the blasted forest, an energy that may be the legendary sun blade, a weapon capable of defeating the Necromancer.
What the Diviners sense is the downed aeon starship Tähtihohde. Warred over by the ship’s inhabitants and assaulted by the Necromancer’s minions, the ship is controlled now by a clan of svartálfar who are attempting to repair the ship.
Following the Diviner’s instructions, the PCs discover a curved metal trapdoor in the middle of the dark forest. Opening it reveals stairs, 30 feet wide, leading down into a metal-lined corridor dimly lit from glowing floor runners.