system
Given the following post, respond as if you're commenting on Reddit:
human
[WK40] Why not just destroy the tomb world while all the necrons are sleeping?

I mean ... they are sleeping there so why not glass them to the core while the necrons are in dreamland?
gpt
There's a lot of tomb worlds, and many times it's not known that a tomb world is a tomb world until we dig deep enough to find the tombs. Sometimes longer, because there usually aren't survivors when people find Necron tombs. Thus, by the time we're sure Necrons are present we also have several bustling cities and industries.



Secondly, because of the depth and strength of Necron architecture a standard planetary bombardment is not guaranteed to destroy the Necrons. But it will probably wake them up.




And lastly, it's expensive to glass planets, especially planets that already have major population centers. We can't just do it willy-nilly.