The most challenging faciendum of my waifu training boot camp was the obstacle course, where I had to crawl under my waifu’s body pillow, climb over piles of manga, and navigate a maze of anime...

Faciendum - Something that must be done.

https://en.wiktionary.org/wiki/faciendum

The most challenging faciendum of my waifu training boot camp was the obstacle course, where I had to crawl under my waifu’s body pillow, climb over piles of manga, and navigate a maze of anime figurines. It was grueling, but it prepared me to become the ultimate waifu.