Is there a way to set a room as extremely unrequired, even for mastery? I want to have a couple impossible rooms in my hold (near the start, it's extremely obvious they're impossible from even the smallest glance, and to get to them you have to do really stupid things like kill royalty.) as 'punishment' dead-ends for people who do stupid things... like kill royalty. In their own castle. While they're surrounded by guards, the only way out is through guards, and if you go through that way, you get to the impossible room (which, SURPRISE! has more guards, and these ones aren't NPCs to start with
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I know I could set all the characters you need to kill wrongly to get here as invulnerable, but this way is much more fun. At least, more fun for me!