There are a bunch of Anomaly Commissions that you can do in Neverness to Everness in exchange for some amazing rewards. One of them is called “Yarn Ball or Fons?” which is essentially an Anomaly that resembles a giant monster cat.
If you’re unsure where to find this commission, then this guide is for you.
Where to Find Yarn Ball or Fons?

First off, head to the Gold Apple Collection Hall in the New Herland District. Enter the building and approach Date, the Gold Apple Collection Hall Director, who you can find in the right corner just below the stairs.
Talk to him and exhaust his dialogue, which will then unlock the door to the right. With the door open, just follow the path and keep heading downstairs until you reach the elevator.
Activate the elevator and go to the B1 area of the building.

Once you reach the floor, you will immediately spot a giant cat-like monster from a distance. Enter the arena to start the fight.
This monster is called Mammon, and if you want to have a chance of defeating it, you need to bring the best team combination with you. After all, this fight is rather difficult.
Defeating Mammon will automatically complete the Yarn Ball or Fons? Anomaly Commission. Simply head back to Date to report the result.
You’ll also receive 40 Annulith, 80 Silver Carrota, 5 Anomaly Material Selection Box I, 7,500 Beetle Coin, and 30 U-00NE as rewards.

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