It is completely impervious to all weapons and all 3 address disruptor strengths. It's head is solid, and can be ridden on. This is similar to the properties of the Annihiwaiter.
It floats in a large circular pattern, and is unaffected by solid walls.
Visually, it appears to be a light-green blob of fungus with yellow eyes(?) and tendrils/tentacles hanging underneath.
Given the fungal appearance, it may have been planned to be a platform in Absu like the Annihiwaiter's function in Ukkin-Na.
Incidentally, it also looks a lot like the Martians from Metal Slug.Here's a video of one hacked into a playable area: