While the heroes recover in the liberated sun-city of Kahlannal, efreet launch an assault on the Burning Archipelago from deeper within the sun. The PCs have the advantages of position, knowledge, and surprise, giving them a unique opportunity. Using technology from their new allies, the anassanois, the PCs can approach stealthily to infiltrate the efreeti base known as the Crucible. Thwarting the invasion requires returning the Far Portal to the surface of the sun. However, the forces overseeing the base won't stand idle. In the end, General Khaim, the efreeti commander, risks everything to realize his plan to dominate the Burning Archipelago and destroy the meddlesome intruders!
"Assault on the Crucible" IS a Starfinder adventure for 11th-level characters, by Jason Tondro.