Laughing face shining in the dark

Exploration Stage: Hall of Departure
From: Jack
Description: The Halloween spirits of this city, who are also immortal beings, will surely miss Alex when he is gone. He even helped the spirits overcome their greatest enemy, boredom. We should touch on that in the soul judgment. That time, Alex was given a multi-faceted mask as a thank you. Can you help me find that for me?
Completed: These multifaceted masks symbolize the essence of Halloween: fear and fun. Alex once set the standard for a concert for the spirits, complete with songs and fireworks. His lively shows have revitalized the spirits after a long period of boredom!