Board Thread:Questions and Answers/@comment-24975288-20140809171550/@comment-5265497-20140814230511

"It is possible for the Beyonder to be weakened, albeit by performing such a great feat as destroying a fundamental force of the universe such as Death."~Marvel wiki

"stripped of his powers by Doctor Victor Von Doom in Battleworld"~Marvel wiki

"The entity was entirely unaware of the existence of other beings"~Marvel wiki

Uhm, so omnipotence has a weakness and he is so omniscient that he was entirely unaware of the existence of other beings? Here is the Omnipotence and Omniscience page if you need any clue as to what the power entails.