Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Do the quest as normal until you speak with Sebastion outside of a dungeon and are given two dialogue options.
Source: https://www.digitaltrends.com/gaming/hogwarts-legacy-learn-avada-kedavra/