Magic devourer

The magic devourer is an ancient formless spirit. It eats slowly the local magic energy. In the early stages this is not a problem, but it grows with every day to a size that the local magic can not keep up with. Then the magic reduces over the next months. After 2-4 months the first pebbles start to turn to dust. After that the land itself starts to deform. It starts small but these change get bigger and bigger until the local magic is too weak to hold the land together. Then parts of the land drift away into the sky. The fight with this spirit can also scar the land. It can use the magic to cast powerful spells. It also can transform its appearance into other creatures. Most of the time as a last action they try to kill everyone in a range and this can harm the land even more. The scared places can be easly identified and stand there silenty as a memorial for future generations.