Tablet of calamity

This tablet is capable of summoning demons in large amount. It probably originated from the demonic homeland. the item is mysterious and nobody truly knows it's history. It is known that the item is incredibly dangerous and that simply using it for it's simpler uses like taping into it for magical energy wich it can funnel from somewhere unknown is a dangerous endeavor that shouldn't be done lest you accidentaly want to destroy you own world.