Overview
Ryza’s plasma technology gives its priests something other forge worlds want and cannot easily reproduce. Inside the foundries, power has to be contained with precision. Outside them, repeated ork attacks require a less delicate application of the same expertise.
The world supplies demanding Imperial formations while keeping enough force at home to defend the places making their weapons. Its priesthood has become experienced in both kinds of work. A gun completed in a Ryzan factory may be urgently needed by an army far away, but that army has to compete with the enemies already approaching the factory.
M41 and M42 status
Forge world of unmatched plasma artifice.
Besieged forge turning its every gun to its own survival.
Timeline
Plasma weapon consignments set segmentum supply records.
Twin Ork WAAAGH!s under the warlords Grax and Rarguts descend on the Ryza system in strength.
With Waaagh! Grax finally broken, the birth of the Rift brings a fresh daemonic invasion; Ryza turns its whole output to its own defenders.
Ryza fights on as a besieged fortress-forge, every cannon and round it makes committed to an all-out battle for survival.
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Cartographic positions and several administrative details are intentionally approximate where published Warhammer sources conflict or provide no canonical coordinate system.