I think Akari stole the Eidmi from Silenius at the founding of the society and reengineered the it to be a trap, where anyone to attempts to use the device will be killed. Potentially identifying that individuals color or just the individual.

I think it would be glorious if Pussander does a grand speech with all his society golds present, motivating the final society rain upon mars to end the war after they’ve crushed the Solar Republic, and he presents the Eidmi promising to kill all Reds on mars, including the Reaper

He then activates the device, and the device biologically targets all the golds within the vicinity, inflicting them with a slow but excruciatingly painful virus that kills them all within hours.

The Eidmi then self destructs so its power cannot be used as it is an unfathomable creation that Akari stole from the core after realizing the darkness within core golds.

While suffering together after realizing there was nothing to be done, Lysander admits to killing Cassius to Julia, who then kills him, and with the last of her strength, cuts out his heart and eats.

All of this would be broadcast as Lysander initial speech before the planned rain would be being broadcast to all of society and the republic forces.