I’ve noticed that to get them to show up you gotta slow down your treasure deposits. I know at least 2 will spawn at the checkpoints, are the rest of the spawns completely based on RNG? How does Ruffian spawning work?
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The first Ruffian can spawn after hitting 60% and the second after hitting 80%, but there is a significant delay before they actually spawn. There's also another event that can generate a large number of treasure engrams instead of a Ruffian, so 2 are not always possible at each gathering point.