Once you enter Act 2 of Clair Obscur: Expedition 33, you can start building relationships with each of the main characters after going back to camp and speaking with them one-on-one. While it might seem like this is simply about building backstory and developing characters for the narrative, increasing relationship levels with each character actually unlocks new combat skills and unique exploration abilities. If you don't want to miss out on both some excellent storylines and the best Gradient Skills in the game, I highly recommend going back to camp often and speaking with each character,