These are some designs for DnD style slime monsters with a crystal core.
This is a design for twin slime monsters Fischer and Egbert. One has a smoother, spherical core while the other has a more crystalline core. They tend to move in sync with ice-skater coordination and grace.
This is a design for a snapping skull, a floating skull that both generates and uses mist to move around.
This is a design for a walking, mist-filled lesser skeleton sorceror.
This is a design for a minor or young adult stage minotaur monster.
This is a design for a lesser horned demon, the adult stage of the minotaur monster.
This is a design for a Wicker Man inspired woodsprite.