A noun formed from a verb or corresponding to a verb is called verbal noun
God is seen as a powerful being who, when angry, does things like flood the earth. If Grendel was baring God's anger then this suggests that he is a very powerful, mighty being but since he is angry he is powerful in a negative way. The word entrap also lends to the idea that Grendel is a monster because to entrap and make way with someone or something is a very negative thing.
What do you mean please explain what you mean
Biological daughters and step daughters?