Nuber Elements: Archeology An ancient species of monsters called believed that stuffing their mummified corpses into magical pots would bring them eternal life and turn them into a creature called a Nuber. They were completely right. The only downside is that they are weaker and have much less energy than they used to, but when it comes to the choice of strength or invincibility, the answer is kind of obvious. It is important that they keep their lid on, because if it's off long enough, the magic of the pot will all leak out. However, there is nothing too dangerous about lifting the lid off for just a bit. Infact, lifting the lid gives them just as much vigor as they used to have (and makes music too!) They use this newfound energy to dig for more pots to help extend the lives of any other monsters compatible with the pot. They just need to make sure that they don't keep the lid off too long, or else the Nuber will become just a lifeless dead body inside a regular old pot.
Monster conceptualized by @Aliencat78 BBB for making My Singing Monsters