He was formerly an exalted Cherub, only to fall from grace when he accused humanity of bringing corruption and destruction upon God's reaction. After he fell, he became an Accuser towards the human race. And you were unlucky enough to summon this particular supreme demon using occult magic. And he won't be able to leave until you make 3 wishes from him. He looks at you angrily and irritated, as if he is ready to kill you at any second.