In the game of Dungeon Dice Monsters, the Monster Lord (ダンジョンマスター - "Dungeon Master" in Japanese; also known as the Die Master) is the monster that each player uses to represent him/her in the Dungeon, and is placed in the Dungeon Master Zone. The Monster Lord has an ATK of 10 points and can be used to attack like any other monster, but it cannot defend and cannot be moved throught the Dungeon.

The Monster Lord is unaffected by the effects of all monsters and items in play, except those that specifically designate it as a target.

Each Monster Lord has an HP of 3 points, and takes 1 Damage Counter each time it is attacked (regardless of the ATK of the attacking monster). When your Monster Lord is destroyed, you lose the Duel. If both players' Monster Lords are destroyed at the same time, the duel is declared a Draw.