Sludge

The Sludge is a recurring monster class in the Disgaea series first introduced in Disgaea 3: Absence of Justice.

Appearance
A Sludge is a living slime creature. They generally wear a horned skull on their heads and usually have an open mouth. The skull has two small teeth.

In its default coloration, the Sludge is a green blob of slime, who wears a tan-white skull with gray horns. The tiers of the sludge are named after their main color, except for the "Grey Ooze" tier which is actually dark purple or bright pink depending on the game.

Characteristics
Sludges are ancient primitive creatures with soft, viscous bodies that allow them to resist physical attacks. They are able to split and recombine themselves. They wear skulls to look more intimidating. When a Sludge is hungry, it hides underground and pounces on other monsters. They have no eyes, so they can't see. They are very dumb creatures and they are highly adaptable.

Gameplay
They have high defense which allows them to resist physical attacks. They also have a decent attack stat. However, their resistance is very poor making them susceptible to magical and elemental attacks.