Devourer

A crystalline structure floating through the depths of space bears tidings of destruction: “The Devourer approaches!” The is a gigantic ring monstrosity that attaches itself to planets harboring carbon-based life. With its titanic tubes it strips those planets of all their natural resources, spewing out their remnants like mere scraps. Epsilon Eridani has already been visited by this catastrophe. Will Earth escape the same fate?