Since you're the only priest, I'd say it sounds a bit more like a vendetta against you, not an attempt to keep people from playing priests. My take from 10,000ft up
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To be clear, I was told in 3 separate realms I "could not play an infiltrator in this realm", in those exact words.
In the first I went ahead & stabbed a realm mate, so that is the unrelated reason I was banned and left. No complaint there about the ban.
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It DOES sound like some rulers have misinterpreted the rule, is all it was; hopefully now it is all cleared up for everyone.