▁are ▁also ▁used ▁when ▁an ▁Non - Player ▁Character ▁is ▁oppos ing ▁the ▁Player ▁Character ▁when ▁performing ▁a ▁Default ▁Sk ill ▁roll . ▁Each ▁Pur ple ▁Die ▁represents ▁an ▁N PC ▁ant agon ist ' s ▁Green ▁Die ▁in ▁an ▁attribute ▁( or ▁a ▁Reg ular ▁skill ▁level ▁if ▁it ▁is ▁higher ▁than ▁the ▁character ' s ▁Attribute ). ▁▁▁▁▁▁ ▁Y ellow ▁D ice ▁( Pro fic iency ▁Die ) ▁( a ▁ 1 2 - s ided ▁yellow ▁die ▁with ▁black ▁mark ings ) ▁indicate ▁the ▁character ' s ▁level ▁in ▁a ▁skill . ▁Each ▁level ▁in ▁a ▁skill ▁subst it utes ▁a ▁yellow ▁die ▁for ▁a ▁green ▁die ▁in ▁a ▁skill ▁roll . ▁The ▁yellow ▁dice ▁are ▁like ▁the ▁green ▁ability ▁dice , ▁except ▁they ▁have ▁a ▁" T rium ph " ▁( crit ical ▁success ) ▁result ▁on ▁one ▁face . ▁Red ▁D ice ▁( Ch allenge ▁Die ) ▁( a ▁ 1 2 - s ided ▁red ▁die ▁with ▁white ▁mark ings ) ▁are ▁used ▁with ▁an ▁extreme ▁difficulty ▁level . ▁Red ▁dice ▁are ▁like ▁the ▁pur ple ▁difficulty ▁dice , ▁except ▁they ▁have ▁a ▁" Des pair " ▁( crit ical ▁failure ) ▁result ▁on ▁one ▁face . ▁They ▁are ▁also ▁used ▁when ▁a ▁named ▁Non - Player ▁Character ▁ant agon ist ▁is ▁oppos ing ▁a ▁Player ▁Character ▁when ▁performing ▁a ▁Reg ular ▁Sk ill ▁roll . ▁Each ▁Red ▁Die ▁represents ▁one ▁level ▁of ▁the ▁N PC ' s ▁Y ellow ▁D ice ▁in ▁a ▁skill . ▁▁▁▁▁