I don't think that it's impossible to convert a power gamer to a roleplayer. Although the task can be daunting. Don't expect results overnight.
Try presenting situations that can only be surpassed through roleplay. Don't present the situation as a total blockage, but rather as a small side feature. At first the players will most likely ignore your attempts to get them to roleplay. I suggest making the roleplay opportunities more appealing. Such as rewarding the player who did take the bait with some piece of information that eludes to gaining a powerful weapon or treasure of some kind. That should be enough of a hook for the powergamer. You can string them along through all sorts of roleplay encounters to finally reach the prize that was promised. I would mix in some combat encounters as well to keep them happy and disguise the fact that they are roleplaying. You could make an entire campaign out of it.
Another approach is to punish for not roleplaying. This can be a bit tricky. I recommend only doing so with a well planned encounter. For instance, pit them against seemingly unbeatable odds with the only way out being through roleplay. Use this sparingly as the tpk or roleplay situation will be frowned upon. If you do try this method make the odds only appear to be dismal. Perhaps with an illusion spell or 12. Of course this could backfire on you. So again, you will have to carefully tailor the encounter to your players.
Of the two methods I have found good success with the first and only fair with the second. If you can't seem to convert them, remember that if it's not fun for you, then you should look for new players.
Try presenting situations that can only be surpassed through roleplay. Don't present the situation as a total blockage, but rather as a small side feature. At first the players will most likely ignore your attempts to get them to roleplay. I suggest making the roleplay opportunities more appealing. Such as rewarding the player who did take the bait with some piece of information that eludes to gaining a powerful weapon or treasure of some kind. That should be enough of a hook for the powergamer. You can string them along through all sorts of roleplay encounters to finally reach the prize that was promised. I would mix in some combat encounters as well to keep them happy and disguise the fact that they are roleplaying. You could make an entire campaign out of it.
Another approach is to punish for not roleplaying. This can be a bit tricky. I recommend only doing so with a well planned encounter. For instance, pit them against seemingly unbeatable odds with the only way out being through roleplay. Use this sparingly as the tpk or roleplay situation will be frowned upon. If you do try this method make the odds only appear to be dismal. Perhaps with an illusion spell or 12. Of course this could backfire on you. So again, you will have to carefully tailor the encounter to your players.
Of the two methods I have found good success with the first and only fair with the second. If you can't seem to convert them, remember that if it's not fun for you, then you should look for new players.
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