Durinor wrote:Yeah, we've looked into that sort of thing. I can't imagine the time it would take to learn that with six different shaped dice and finding the sweet spot on every surface he rolls on. Thick stacks of paper, hard back books, hardwood tables, plastic tables, metal tables, tables with a playmat on it. If he consistently rolled on only one surface type, I'd be concerned, but every different surface will affect the die roll differently. And when he's throwing the dice and they bounce from tabletop to paper stack to playmat, it would take Rain Man to have that figured out.
It takes about 5 minutes to learn how to throw a d20 to increase your odds of getting a 20 to about a 1 in 6 chance. The surface your die lands on has only a little bit of affect on the outcome. The trick is which number is on top of the die when you launch it and the amount of spin you impart. One of my old GM's showed me how to manipulate dice rolls. In less than five minutes our whole table was able to get 20's pretty consistently. Learning how to do that has helped me notice which players are honest at my tables and which are not. Some players may not be aware they are manipulating the dice. They just know that they have a lucky way of rolling.
Anyways without being there it is hard to see if there is actually any dice manipulation going on. I would suggest that he roll up a caster that focuses on blasting. If that is not an option then as a DM just ignore every other attack he does. That should bring him down to about the rest of the parties effectiveness. If the party starts to catch up with his ability then just adjust it back to normal. Just don't tell him that you are doing this.