This chamber is created so the players can make their pets Neon/Mega Neon. You need to level 4 of the same type of pets to full grown/luminous and put 4 of the pets in the 4 circles. The neon version of the pet will appear in the middle circle after that. As of April 18th, 2020, you can make Mega Neon pets. You will need 4 of the same type of neon pets and age them from reborn to luminous, and put the 4 neon pets in the 4 circles. The mega neon version of the pet will appear in the middle circle after that, changing to different colors (sometimes rainbow), instead of the normal one-time color.
Also see: Neon Pets