Halloween themed, Genshin Impact, official artwork, spooky atmosphere, dark blue-purple color palette, misty fog, eerie lighting, Paimon, Qiqi, Xiangling, Diluc, Kaeya, Fischl, Barbara, Venti, Zhongli, Tartaglia, in costume, witch hats, broomsticks, pumpkins, spider webs, gravestones, haunted mansion, abandoned church, mysterious forest, full moon, creepy trees, glowing eyes, intricate details, vibrant colors, dynamic composition, cinematic lighting.