Arch Nemesis is the final form of mean relationship. Your Arch Nemesis is similar to the antagonist to your fairy tale. Nothing but pure evil. For you achieve this kind of relationship, your Relationship Level with your Nemesis Sim should be at least level 10 for the social event for Arch Nemesis appears. Your hatred with your foe can still subside, but this will take time as you need to start from being a friend again.
Generous These Sims give a bit better daily Login Rewards
Lucky These Sims occasionally give you bonus XP while at home
Mean These Sims get a bonus every now and then when being insulting with others
Competitive These Sims are a bit better at Rival Events
Good Upbringing These Sims are way better at all Events