Board Thread:Warhammer 40k General Discussion/@comment-79.134.161.49-20130225232452/@comment-5880884-20130308111131

Actually, there are many weapons that can wreck the tyranids. The eldar (formerly) had blackstone fortresses that could wipe star systems. The imperium had weapons (Used by the blind king in the occlusiad war) that could cause stars to supernovae. However, these races would never use them as they can cause too much destruction.

On a side note, the Mechanicum is rumoured to be created with the direct help of the C'tan god, Void dragon. So I keep having this question as to why the mechanicus isn't more advanced and can maintain their technology, since the void dragon is a god of the material realm.