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The GRB factor, short for "Gulus Realm Burst", is a contagion produced by Regulusmon. It is said to cause Digimon to undergo a twisted change in personality and run amok. Unlike Black Digitron, the GRB factor has been confirmed to cause infections in carriers.[1] Simulations of injecting Regulusmon with enormous amounts of GRB factor reliably predict that it will induce Regulusmon to digivolve to Arcturusmon, who is able to directly weaponize the GRB contagion via its arm drills.[2]
