system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40K] The C'tan, what's their deal these days? And how are they (apparently) the only living things with zero warp presence.
gpt
Calling them "living" is kind of a stretch to begin with. They occupy a weird space between being dictated by physics and by thought. 

Most of them have been shattered and are being used as power sources and/or weapons. 

[Disclaimer: am not a Necron player and have not read the codex since fifth edition]