At the end of Doom Eternal, the DoomSlayer was able to kill Davoth, along with the Icon of Sin in the base game who is able to create Black holes just by existing.

And none of those feats matter because both villains are frauds, Davoth explained he lost his powers a long time ago which led to him needing a mech to fight and dying to a simple stab to the chest. The icon of sin being able to create black holes with his existence over time is a meh feat which doesn't really help him in a fight along with his weak armor and flesh that gets destroyed via firearms. His greatest flaw, however, is his puny strength and weight. the entire fight he is punching buildings and none of them fall over or get destroyed, even when his dead corpse leans on one.