The adventurers find themselves marooned on the Rock of Bral, a bustling asteroid city in Wildspace, after the merchant vessel carrying them is destroyed by space pirates. To escape and pursue their goals, they must acquire a spelljamming vessel of their own — whether by earning one through a patron's favor, salvaging a derelict in the nearby asteroid field, or seizing one from the very pirates who stranded them. Along the way, they learn the basics of spelljamming: helms, gravity planes, air envelopes, and the strange physics of Wildspace.

With a ship under their command, the adventurers accept a lucrative but dangerous contract to transport a sealed cargo across Wildspace to a distant crystal sphere. The voyage takes them through uncharted regions of the Phlogiston, past dead-god carcasses drifting in the void, and into the territorial waters of hostile alien civilizations. A githyanki war fleet prowls the route, and a neogi deathspider shadows the party's vessel, waiting for the right moment to strike. The sealed cargo proves to be far more valuable — and dangerous — than anyone disclosed.

The cargo leads the adventurers to a dying crystal sphere whose inner surface has begun to crack, leaking the raw chaos of the Phlogiston into the system within. An elder evil — a cosmic entity from the space between spheres — is forcing its way through the fractures. The party must rally the fractious inhabitants of the sphere's worlds, seal the breaches using ancient spelljamming technology hidden in a fortress-ship graveyard, and confront the entity's vanguard before the entire sphere collapses and takes several worlds with it.

A city built on and inside an enormous asteroid tumbling slowly through Wildspace. The topside is a bustling port city with docks, taverns, markets, and embassies from a dozen spacefaring races. The underside is a lawless warren of smuggler tunnels and black market dens. Gravity pulls toward the asteroid's center, creating two distinct surfaces separated by a thin zone of weightlessness.

The rainbow-colored, flammable ether that fills the space between crystal spheres. It flows in vast rivers and currents that spelljammers ride like ocean vessels ride trade winds. The Phlogiston is hauntingly beautiful — swirling curtains of color — but deadly. Any open flame, including fire magic, causes catastrophic explosions. Strange creatures and lost vessels drift in its currents, some for centuries.

An abandoned mind flayer vessel drifting in the asteroid field near the Rock of Bral. The ship is organic and disturbing — its corridors pulse like veins, its walls are damp and fleshy, and the helm is a brain-shaped device that responds to psionic energy. The illithid crew is gone, but their intellect devourer pets remain, hiding in the shadows and waiting for fresh brains to inhabit.

A hollowed-out asteroid in orbit around Oerth, converted into a magical observatory. Crystal domes allow viewing of Wildspace in multiple spectra, and massive orreries track the movements of worlds within the crystal sphere. The interior is a cluttered warren of star charts, arcane instruments, and half-eaten meals, reflecting its occupant's obsessive focus on research over housekeeping.

A lush, tropical world inside the Shattered Sphere, home to the hadozee civilization. Massive trees stretch miles into the sky, and the hadozee build their cities among the canopy. The Phlogiston leaking through the sphere's fractures has begun mutating the jungle's wildlife into aggressive, unnatural forms. Storms of raw chaos energy rake the surface.

A vast debris field orbiting the Shattered Sphere's dying sun, composed of dozens of enormous spelljamming vessels from a civilization that predates recorded history. The ships are miles long, their hulls fused with crystal growths and trailing frozen atmosphere. Automated defenses still function sporadically, and scavengers have picked through the outer hulls, but the deep interiors remain unexplored — and guarded.

Stranded on the Rock of Bral after their transport was destroyed, the party needs a ship of their own. Options include salvaging the derelict nautiloid in the asteroid field, earning one through a patron's favor, or taking one by force from those who have wronged them. A ship means freedom in Wildspace.

Captain Ozamata's contract is simple on paper: transport a sealed adamantine chest from the Rock of Bral to a contact in Greyspace. The pay is three times the normal rate. The catch is everything else — pirates, neogi, and the unsettling warmth radiating from within the chest itself.

Stellavera's research indicates a crystal sphere is dying — its shell cracking and leaking the raw Phlogiston into the worlds within. The god-fragment in the adamantine chest may hold the key to sealing the fractures. Travel to the Shattered Sphere, find the means to repair it, and prevent a cosmic catastrophe.

Vrazix the Chainlord and his deathspider crew are relentless in their pursuit of the god-fragment. The neogi lord will not stop until he has what he wants. The party must find a way to neutralize this threat — through combat, cunning negotiation, or turning Vrazix's own treacherous nature against him.

Intellect Devourer Ambush

The derelict nautiloid's former passengers left behind a nest of intellect devourers — brain-shaped aberrations that hide in the organic walls of the ship and leap at intruders, attempting to devour their brains and puppet their bodies. The cramped, fleshy corridors limit movement, and the devourers use hit-and-run tactics.

Pirate Boarding Action

The pirate fleet attacks in the Phlogiston with a hammership and two mosquito fighters. Catapult stones slam into the party's hull while pirates swing across on grappling lines, cutlasses in teeth. No fire magic is possible in the flammable Phlogiston — a serious limitation for most spellcasters. The pirate captain fights from the quarterdeck of his hammership.

Neogi Slaver Attack

Vrazix's deathspider launches a coordinated assault, deploying umber hulk boarding parties through the party's hull while neogi officers direct from behind, using their psychic enslavement abilities to turn crew members against each other. The neogi fight dirty — poison, traps, and hostages.

Beholder of the Graveyard

Deep in the fortress-ship graveyard, a beholder has made its lair in the flagship's command center, surrounded by the treasures it has hoarded from the ancient vessels. Its eye rays blast through corridors as the party tries to reach the sealing device. The beholder has modified the ship's automated defenses to serve as additional security, creating a layered gauntlet of antimagic and disintegration.