Emergent Century

Fungal infection first takes root in wheat exports. First infectees report strange symptoms

As infection spreads, The Hive Mind starts to realize what's happening and accrete into a single unified political entity. Fear and general human shittiness lead to quarantines, crackdowns, atrocities

Open violence erupts

Someone (nobody knows who) drops Luna onto Earth, presumably intending to prevent any further spread of the Hive.

The war officially ends in a truce and an armistice rather than a surrender. Unofficially, it's a stalemate that favors the Jovian Consortium. Apsis is established on Ceres as an ostensibly-neutral body under the oversight of stellar shipping magnate The Man Upstairs.