Paimon notice that the Magic Buble was Corrupted and Change it's Color.

"Homeward, He Who Caught the Wind" is a flagship event and story quest in Genshin Impact. In it, the Traveler and Paimon return to Mondstadt to participate in a special welcome ceremony for returning knights, reliving the beginning of their journey through a whimsical, memory-based magic bubble world created by Alice and Nicole.