Beshemoth slimes are enlarged she-slimes, much like behemoth slimes being enlarged slimes. Other than the color change to a red-orange hue, there are no differences in appearance.
Beshemoth slimes can be synthesized by combining a behemoth slime with a she-slime. Certain scouts may also use the monster if synthesis is not the favored option. Two beshemoth slimes, along with a king cureslime and metal king slime, are necesary to create a darkonium slime.