system
Given the following post, respond as if you're commenting on Reddit:
human
[Dead space] who created the markers, and for what purpose?
gpt
*** spoilers*** Markers are the beginning of the life cycle of a brethren moon. We are unclear about the origins about necromorph moons but presumably they create the black markers. They then launch the marker to a planet inhabited by intelligent life, or the markers influence a planet to create intelligent life.

Once an intelligent organism discovers a marker, they see it as a perpetual energy machine. They then reverse engineer it, or are driven to do this by the markers psychic emanations. They then create red markers, which start the necromorph signal. This makes necrotized organic matter come back to life and spread the necromorph matter.

This brings the final stage of marker development. When enough organic matter has been converted, a convergence event begins. The black marker creates a gravity well sucking up a large chunk of earth as well as all organic matter on a planet creating a brethren moon. Thus a new brethren moon is born to launch black markers and make more moons. So, their purpose might be to consume and multiply like all living creatures.