I swear there's a mechanic i've read somewhere. Firstly I think I meant 'spending a force point but drawing from the dark side'.
Secondly, ok on reading up on this, damn! Saga removed it! It was a wonderful, simple bread and butter rule that allowed you to declare that you were 'drawing from the dark side' and it gave you an extra die to roll, but as a result, you copped a dark side point. It was a constant lingering temptation for the players and a great role-play tool that it would seem is only in 'star wars d20'. In addition, someone with 'strong in the force' could roll up to 4d8, but would gain 2 dark side points.
Actually Greenkarl, there isn't a mechanic I could more strongly recommend. The thing that makes players scared to draw from the dark side is their fear of becoming an npc.
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