Examples: d20 + 5 advantage(d20) // roll twice, pick the highest advantage(d20+roll(d4)) == advantage(d20) + d4 // bless d100+d10 // d% 8*d6 d12+7 d8+3*d6+5 advantage(2d6+3) advantage(d20,3) // triple advantage. roll three times pick highest disadvantage(d20) [Source]