MarvelCosmology

The Living Tribunal serves The One Above All and is stated to be the next most powerful being in the cosmology. It is the embodiment of TOAA's judgement throughout Marvel and transcends all other cosmological entities. His verdicts bind the cosmos.

Despite that, the Living Tribunal will very rarely intervene in stuffs and let the story pan out. In fact, TLT will even help in the progression of stories in events/comics where it itself gets put in an embarassing position in that story. Simply because the story demands it and TLT serves TOAA who is essentially the writers of the story.

Similar to TOAA, there is an aspect of TLT for each multiverses and universes. As such, the appearances of TLT in comics are aspects/manifestations, including the one that was "slain" by the Beyonders.

The Living Tribunal is transcendental to Space and Time. As such, TLT is unaffected by the destruction of space-time and can stand outside of it.

Even the powers of the Infinity gems dwarf to his universal aspect. With a mere gesture of his fingers, he disperses an enraged Adam Warlock unleashing full power of the infinite gauntlet.

TLT speaks; and the "soundless sound" of his speech alone kills Zom, who bodied both Ancient One and classic strange just before this.

Just by touching the void at the back of TLT's head, Silver Surfer became an infinite being and gained temporary godhood.

Can seal the Beyonder and his realm away.

With the help of TLT, Dr. Strange was able to remake the universe exactly as it was from nothing.

Erases Protégé in cosmic time. Protégé was rivaling Eternity and was trying to usurp the one above all. According to TLT, power like Protégé was meaningless from the level of existence TLT was dealing from.

Casually banishes Slorioth which is an eldritch pan-dimensional being. It was stated Slorioth was so vast that simply his physical being manifesting could not be contained in any dimensionality.

The Watcher needs permission of TLT to even watch matters related to him.

The death of death is just an aspect of TLT, and it is so big Jane with the all-weapon still could not wrap the idea of it in her head (and Jane has been to The Far Shore).