The signature die of Dungeons & Dragons, and taller than its siblings, the D20 rolls further because it is the most spherical. The faces are equilateral triangles.​ The D20 is used any time you want to know if an attempt is successful: attacks, saving throws, skill checks, and ability checks. Each value has a 5% chance. After you roll a D20 to see if you hit an enemy, you will roll other dice to see how much damage you deal. Small weapons use a D4, larger weapons deal D6 or D8 damage, and the biggest deal D10 or D12.​ D20, The “decider” of D&D dice.