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Living Wall Stains are an exclusive entity of Level ⎷⎠⎝⎛⎝0⎞⎝⎛⎫⎛⎝⎛⎛⎞ , they are what they are called.
They are living wall stains, that react to human reaction, these stains have the ability to grow and shrink easily, if it is seen, it will shrink.
But at default, it grows a meter per hour. And when the stains are not seen by any explorers, it is reported thye will make weird noises, like child cries.
It is rust.
Leave them alone.
Touch it
Mind the noises it will make.