Exploiting the AI
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If you find a situation in which the AI can't work out how to get to you, and you can still kill them somehow. You are exploiting the limitations of the game engine. This is cheating.
When I see it, I just DM kill people. If they do it again, I delete their character. If I see it again, I delete all their characters. If they still do it, I will just ban them.
Cheating sucks, it makes it unfair to everyone who doesn't cheat.
Dont do this.