While there is no widely published academic or official "paper" regarding a specific "Halloween task" involving Shen Xinyu and Xia Qingzi

Task 3 – The Spoiled Spell

Trick: Write a Halloween spell on paper, but replace 3 words with “pumpkin,” “skeleton,” or “spider.” Xia Qingzi casts it literally.
O’ Best: The most chaotic literal result (e.g., “Turn pumpkin into prince” – if no pumpkin, you must draw one screaming).

The "Trick o Best" Halloween task involving Shen Xinyu Xia Qingzi (also known as Kiki Xing Yun

This guide details the "Trick or Treat" Halloween task involving the characters Shen Xinyu Xia Qingzi