Msm, also known as Grumpyre, is a rare monster in the game My Singing Monsters. It is a grumpy, purple monster with a single eye and two sharp horns. Grumpyre can be bred by combining a T-Rox and a Noggin.
Grumpyre is a valuable monster to have in your collection because it can produce a lot of gold. It is also a popular monster to use in breeding combinations, as it can be used to breed a variety of other rare monsters.