Memory:Chaos spider

This eight-legged horror is hard to glance at. Its chitin-covered body seems to bulge, move and change continuously and its six eyes are filled with an alien intelligence. Its mandibles seem to be covered in a purple shimmer. They reek of corruption. A perfectly ordinary spider, apart from the fact that it stands half as high as a human. Still, there's something unusual about it. Is it the strange cunning in the eyes that seem to glow with their own light? Or is it the fact that the head doesn't bear mandibles but a bunch of writhing black tentacles?