These large, floating creatures are appearing in increasing numbers around the Dante Station built above Jupiter's surface. They are at least 2 metres in diameter and float, both in space and in the atmosphere of a space station.
The beings' skin is made of a metal-like substance, but it looks more like living skin. Their "head" has a kind of face, a large mouth and two eyes that glow red, as if they were holes, allowing a view of a core of magma.
A Medusa is able to shoot a glistening jet of fire at its opponents.