 Mark of the Oni | Skin | – | 22,000 |
 Marmalade | Dishes | – | 500 |
 Marrow Jelly | Dishes | – | 500 |
 Marrowbone Barrage | Weapon | – | 675,000 |
 Marrowbone Executioner | Weapon | – | 675,000 |
 Marrowbone Knuckles | Weapon | – | 675,000 |
 Marrowbone Longbow | Weapon | – | 675,000 |
 Marrowbone Piercer | Weapon | – | 675,000 |
 Marrowbone Shield | Weapon | – | 675,000 |
  Mask Bird | Quest | Common | – |
 Mask Green | Quest | Common | – |
 Mask of Sabbath | Skin | – | 20,000 |
 Mask of Sabbath | Skin | – | 20,000 |
 Mask of Sabbath | Skin | – | 20,000 |
 Mask of Sabbath | Skin | – | 20,000 |
 Mask of Sabbath | Skin | – | 20,000 |
 Mask of Sabbath | Skin | – | 20,000 |
 Mask Orange Horns | Quest | Common | – |
 Mask Pink Bird | Quest | Common | – |
  Master's Catalyst | Alchemy | Uncommon | 5,300 |
  Master's Item Upgrade Kit | Cube | Epic | 407,500 |
  Master's Item Upgrade Kit | Cube | Rare | 100,000 |
 Master's Item Upgrade Kit | Cube | Uncommon | 30,000 |
 Master's Trade Unlocker | Alchemy | Uncommon | – |
 Mastery Renewal Dodecahedron | Other | – | 1,000 |
 Matches | Logging | Common | 1,909 |
 Matter Shaker | Artifact | – | 20,000 |
 Mech Spider Cyber T3 | Skin | – | 20,000 |
 Mech Spider Cyber T3 | Skin | – | 20,000 |
 Mech Spider Cyber T3 | Skin | – | 20,000 |
 Mech Spider Cyber T3 | Skin | – | 20,000 |
 Mech Spider Cyber T3 | Skin | – | 20,000 |
 Mech Spider Cyber T3 | Skin | – | 20,000 |
 Mech Spider Cyber T3 | Skin | – | 20,000 |
 Mech Spider Cyber T3 | Skin | – | 20,000 |
 Mecha Bounty Hunter Spider | Skin | – | 20,000 |
 Mecha Pyroscourge Spider | Skin | – | 20,000 |
 Mechanic Spider PostApo | Skin | – | 20,000 |
| Mechanical Board Reader | Quest | Common | – |
 Mechanical Kitty Spider | Skin | – | 20,000 |
 Mechanical Puppy Spider | Skin | – | 20,000 |
 Mechanical Spider | Skin | – | 20,000 |
 Mechanical Spider Base | Skin | – | 20,000 |
 Mechanized Rampart | Artifact | – | 135,000 |
 Medallion of Life | Generic | Common | 2,000 |
 Medicinal Mash | Generic | Common | 960 |
 Membrane | Rune | – | 6,720 |
 Memory Core | Quest | Common | – |
 Memory Core | Quest | Common | – |
 Mend-O-Matic | Other | – | 2,000 |