Orchestrated by the Emperor’s counsel and Fleet Admiral Gallius Rax, the primary Shadow Council was, because the title implied, meant to handle the Imperial Remnant’s counteroffensive in opposition to the New Republic from the shadows, with solely Sloane, now a Grand Admiral, as its public figurehead. However though not as short-lived because the IFC, the primary Shadow Council was doomed from the start, deliberately.
Rax, working on direct orders from Palpatine posthumously launched as part of Operation Cinder—Palpatine’s plans to destroy the equipment of the Empire within the wake of his dying in order that Rebel couldn’t co-opt it, and so it could possibly be reborn within the Unknown Areas alongside himself—deliberately established the council to wipe most of its members off the board at Jakku, in a bid to destroy the planet itself, in addition to the New Republic and Remnant fleets, in a singular battle.
Rax was killed by Sloane above Jakku when she found his plans, and whereas a lot of the Shadow Council was killed on the battle as effectively, a number of survived. Grand Moff Randd fled to the Enlargement area—the galactic house between the Inside and Mid rims—and fashioned his personal Imperial Remnant. In the meantime Sloane and her fellow councilor Brendol Hux, alongside his younger son and several other little one troopers, additionally escaped the chaos.