Board Thread:General Discussion/@comment-11276487-20140224050041/@comment-61022-20140228000845

the Living Tribunal is a singular entity in the Omniverse and has the power to eliminate entire realities with a single judgement. Since the Beyond (at least by his traditional origins) is the sentient energies that make up an entire universe, the Living Tribunal would be stronger since the Beyonder is technically an entire universe and the Tribunal has the power to destroy one -- As seen in the What If? story where he destroyed the universe where Korvac won against the Avengers and took over the universe. He destroyed that entire universe to prevent Korvac from tainting others.

Even when you consider the other "retcons" of the Beyonder's origins (a) that he is a sentient Cosmic Cube and (B) an Inhuman who is also a Mutant.. Again these are all things that are native to a single universe. Therefor the Tribunal could destroy them.

As for the Beyonder's origins, I think there is some intentional deceptions on the account of the Beyond or the creators. I don't totally buy the Inhuman-Mutant idea tossed in during Avengers: The Illuminati.

Anyway... I don't know if you are citing a specific story where the Living Tribunal battled the Beyond or who won, but if the Living Tribunal lost, I doubt that the loss was unintentional. Cosmic beings usually have ulterior motives for their actions.