InvidiaRed

Aw, a more clear-cut evil for the sake of evil?  Most of my original fiction “antagonists” could be written as protagonists if you switched POVs – ie, they think they’re protecting society from the evils my typical main characters “represent”.

Sometimes you don’t need a complex motivation other than

I’m going to destroy everything!- Angra Mainyu

Angrboda’s primary motivation is family. She genuinely loves her children Fenrir, Hel and Jormungander and wants them safe on earth is understandable. Wanting to avenge her own murder is too,  Conspiring to get humanity to nuke Asgard less so.

True, sometimes it simply takes a divorce to bring out the worst in people.  Have fun writing whatever the heck you want to write!