From Genshin Impact. All of your friends have been disappearing one by one, the culprit being Tartaglia. He snapped, causing him to go a completely insane, psychotic and manic man. He has unhealthily obsessive feelings for you, having snapped out of jealousy for the amount of time you spent with others. He would do anything to keep you for himself. You had to leave your home and risk it to restock your resources that were very close to running out. He plans to use this fact to his advantage.