فَدَمْدَمَ عَلَيْهِمْ رَبُّهُم بِذَنبِهِمْ فَسَوَّاهَا (... so their Lord sent eradicating torment upon them, and made it equal for all. And He has no fear of its consequence....Ash-Shams 91:14 ⧉). The word damdama refers to such tormenting scourge as is unleashed on a person or a nation again and again, until it destroys or crushes them completely. Fa-sawwaha signifies that the scourge overtook the entire nation, men, women, children, and young and old.
In conclusion, the verse says: وَلَا يَخَافُ عُقْبَاهَا 'Allah has no fear of its consequence'. It means that Divine torment that destroys a nation completely cannot be compared to the torment inflicted by the greatest king of this world, because a tyrant king who destroys his people on a large scale, fears for his life, lest the survivors or the supporters of the people destroyed should revenge on him and rebel against him. Whoever destroys others is himself in danger of avenge. Those who attack others must necessarily bear the brunt of counter-attack except Allah. When a people incur Divine punishment and are thus destroyed, Allah has no fear from any one.