These changes need to be reverted, fullstop. They’re going in the completely wrong direction.
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Only the King and the Prince should ever be permanently unconvertable. Conversion is a vital part of the game’s balance, and without it (given the large number of protectives out there, including the guaranteed king), Unseen don’t have enough options to deal with their targets. The reasons that person (as far as I recall, it was just one person) wanted the Sheriff to be unconvertable were mostly “it makes it tempting to gamethrow as a Sheriff because I’m afraid I’ll get converted if I’m revealed”; but this risk is a core part of the game, and Sheriffs were exposed to it for a reason.
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Making the Sheriff both unique and guaranteed is an obviously terrible idea that makes it impossible to fakeclaim Sheriff because the (guaranteed-to-exist, knows-he’s-unique) real Sheriff will immediately counterclaim you - especially when combined with the ridiculous conversion immunity, which together mean that the real sheriff faces almost no risk in revealing to counterclaim you in this manner. We need to be moving in the direction of providing more roles evils can claim, not removing one of the few that was available.
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The new ability is unnecessary (Sheriffs were already good at what they did), and, again, makes them harder to fakeclaim.
I just don’t see any benefits to these changes at all - the only thing worth keeping is maybe making the Sheriff guaranteed. If the goal is to differentiate unseen / cult games, there are better ways to do it - certainly better ways than removing Sheriff from the already-short list of things evils can reasonably fakeclaim without extensive prep and luck.