SOMA Enemies (major spoilers)

[hollowleviathan]

On the one hand, they seem to have magical abilities that don't belong in the setting. The Jiangshi can clearly teleport, while #7 appears insubstantial (its complete darkness makes it look more like a spirit or a shadow than anything real)

Pathos-II is also an advanced science facility 100 years in the future. My personal theory is that the Jiangshi simply EMP-stuns Simon and walks normally while you're insensible, so that when you recover, it seems to have teleported.

As for absorbing all light, we already have experimental materials that have oddly heightened light absorption properties. Link. Presumably this creature is a human that the WAU integrated into such a material.