A few quick notes, though I think you already know these.<br/><br/>1: You can only step up Doom dice if multiple opportunities arise on the same roll.  IE, if there's only 1 opportunity created by a player, you can only add a d6 to the Doom Pool, you can't step up a currently-existing d6 to a d8. (98.9% sure you know this, but it's worth saying since there's quite a few dice flying around.)<br/><br/>2: This might be shaky, but according to my reading of the rules for how this works, as per what wander is saying, the die you spend from the Doom Pool determines how powerful the effect is.  IE, if you spend a d10, then you get a d10 effect.  But if you only spend a d6, then d6 is the strength of the effect.  The rules aren't 100% clear on that.<br/><br/>3: Since you succeeded extraordinarily against the action, technically the effect die for the Doom Pool's roll is a d12 (step up by one), though I'm not entirely sure what that means...