Of course, depending on how you hook it into your campaign, it could be that they arrive planning to slay Yorta once and for all. Or perhaps they're coming to rescue him on behalf of a hermetic order. But if you play it as a stable situation the players will likely upset, things could go any number of ways. Both factions in this situation are potentially valuable allies - the Order may be dying out, but they have a ton of expertise and would make valuable mentors. On the other hand, probably has even more to offer for just the right sort of help.
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