The Amos Court and the Takur Ruin Cult were advanced Class 4 civilizations residing within the same galaxy. Due to their attributes and a series of events over history, both had waged all-out massacring wars against each other, with their numerous colonies systemically purged and decimated by other to the point that not even the civilians would take anything lying down now.
Neither Imperator Amos nor the first Grand Patriarch of the Takur Ruin Cult had grown to their present level at the time, while their respective fleets also saw as many defeats as victories. And while they fought, every other middling or inferior civilization was banished or culled to the point of extinction, until the two monsters known as 'civilizations of calamity' were left in the galaxy. The name 'Galaxy of Bloodbath' therefore spread like wildfire across the Multiverse.