Very difficult issue. Honestly I cheat whenever possible. Either as a gamer or as a GM. You give me a dice I will do whatever is necessary to manipulate the result (if you pretend to have problems with arithmetic it helps a lot). I guess most, if not all, GMs have manipulated results in one way or the other. Your powerful necromancer awaits the PCs and his first attack is a really bad fumble to which the rulebook says that the NPC has dislocated his arm and went unconscious. This rarely happens. Your archvillian should appear as an archvillian and not as a member of the Marx Brothers.
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