Ritual magic of the Belle Époque! The desperate Science Jaune of a war-torn continent! Parageometrical horrors perfected in the labs of the tyrannical, overthrown Castaigne regime! Signing, the latest way to turn social media dysfunction into sorcerous reality! Your players can master them all-at perilous risk!

Each spell is a Shock card with effects both useful and sinister. Do they hold onto that that spell they need to do that thing, even as their inner realities start to break apart? Or do they take the safe route, and cast out the buzzing, insistent power of the Yellow Sign?

Black Star Magic features new magic rules for The Yellow King RPG, including 144 startling spells, background material on Carcosan magic in all four YKRPG settings, and GM guidance showing you how to incorporate player-facing occult powers into your game.

Plus, a quartet of scenarios, allowing the characters of each sequence to make double-edged deals with the world of sorcery:

Dancer at the Bone Cabaret pits the art students of Paris against a force that lures their Bohemian friends to the latest, hottest nightspot. But are they the patrons, or items on the menu?

A Casket at Le Thil sends the supernatural-quashing soldiers of The Wars into a village haunted by subterranean enemy activity.

Memories of a Dream Clown confronts the victorious revolutionaries of Aftermath with a treasured but tarnished memory of childhood-and murder!

Love Wears No Mask finds This Is Normal Now's ordinary heroes battling an intrusive yet enthralling phone app, and the dramatic goings-on of the subtly destabilizing dating reality show it promotes.

Play them separately, or chill your players with all of them. All they have to lose is their grip on reality...