Cancer
Some cancers are unstoppable and shall consume until here is nothing left.
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Curious this parasitic creature living on the skin. It eats and destroys the flesh, turning it black in its wake. A web reaching out further and tightly gripping the fertile life surrounding it. The host is drained gray. Slowly consumed until its internal sustainability commences to fall apart. Until the structure necessary for the host to be considered alive begins to collapse. Then and only then does this plague begin to search for its next victim. A fresh host capable of sustaining the parasite until sucked dry.
This corrosive cancer multiplies and grows under most conditions. Although hosts classified ‘M Class’ are at highest risk for they produce the nutrients necessary for the parasite to feed.
The human infection migrating from planet to planet, sucking them dry of life and moving on to the next thing. Destruction. Consumption.
Killing off life as it spreads. As is reproduces.