Chronicle is a 5 dimensional KI, build by an advanced human cyborg civilization. This civilization had discovered and explored every last inch of the univerese, but even with that knowledge the past was the last mystery, that the humans could never solve, so they build chronicle.
It's first goal is always to gather and to preserve all its knowledge. To preserve it, it came to the conclussion that it had to kill and destroy its creators, since they would be the only beings capable of destroying Chronicle and its knowledge.
Terra Mortem once was an earthlike planet with a humanlike alien civilization, but now it is just a barren dead planet with only ruins of the once great cities remaining.