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I tend to dislike encounters that require a lot of dice rolling. I am just not that lucky with dice, but I don't really have any dice rituals though. I choose my dice for aesthetic appeal rather than an belief that they give me luck. I have friends that use strange rituals though like not wanting anyone to touch their dice or talking to their dice before a roll and such.
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"I can't use these dice; they're random!"
I have a set of metal dice that are my "Evil GM Dice" (tm). I often find they roll too well for me when I'm trying not to completely maim the PCs. Too many inopportune crits...a few player knights from our current Pendragon campaign have met grisly fates due to my Evil GM Dice crits. :eek::D