Answer:
Prefixes..
Explanation:
because prefixes always start with a root word,
I would say Anagnorisis. This means when a character makes a critical discovery, in this case he finds out he was sleeping with his mom and killed his father. It also means a change in what a person stood for. He stood for finding who was the killer, and cursed him, only to find out its him.
Serious and anxious would both work, but serious is more likely