The beavers stood around a large blue-glowing pond in the middle of a large cavern, watching the crack in the circular dam they formed around it. "There is a crack forming here! Start the patching process!" A beaver screamed and half of them rushed in with wood and started nibbling at the dam.
They removed the cracked wooden panel and replaced it in less than a minute, seeing them work looked like trained racing mechanics changing the car's tires in the blink of an eye. Those beavers trained their whole life for the sole reason of repairing this dam and making sure it never breaks.
The dam was here for centuries and in that time they optimized their process to the point that what would take humans a year to fix now takes the beaver monks and shamans no longer than a minute. Teamwork, the hardwood of the mana-rich fungus growing around the pond, and the tireless enchantments the shamans kept casting, everything worked like a precise clock.
