Mogahn

A primeval personification of Hunger and desire. Mogahn, also known as Mogahn the mass, is a threat to all reality. An ancient being that strikes fear into even Unicron, Mogahn the mass may as well be one of the greatest threats to creation.

The only true thing which sustains Mogahn are universes themselves. He has destroyed many universes through his many avatars, and though Vector Prime killed all of them long ago, Mogahn the mass will return some day to complete his ancient mission.

He is known by many titles and names, though most are lost to time.

History:

According to his own account, Mogahn the mass was one of many unfathomable powerful beings which existed during the old multiverse, devouring universes even then, Mogahn stopped eating universes for a while when Unicron destroyed creation.

When new creation began Mogahn resumed devouring universes though avatars, however those avatars were killed by Vector prime, and Mogahn had to wait out in the void of creation to heal himself after that confrontation.

Mogahn manifested himself later to the space knights Ikon and Q’b, and told his origin story before leaving, warning them of his impending arrival[Meeting Mogahn]He monologued to himself about his return as he looked at Brail, though nobody heard what he said[The Brail Paradox]

His existence was debated after Virulina suggested the Apocalypse will be caused by the Beast of dimensions as a commentary on Lexor and Witterquick telling of the Prysmosian creation myth[Valour of the Visionaries 2 of 4]

For some reason or another, he decided to save Megatron spark when Unicron tried to extinguish it, and after giving Megatron a prep talk, helped him regain his body. He would also be the subject of a conversation between Megatron and Primus[Journey of Megacron]

He was mentioned by Atlas while explain Exarchon’s origins, a remnant of him called the Hunger stone being responsible for corrupting the explorer, Brail also saw visions of him during Lio primes funeral[The Threefold spark]

When he finally created his avatars across the Multiverse, he started his destruction of said universes. During his time attacking creation, He had nostalgia about when he was first created by Daiakuron during the dawn of time[Spotlight: Beta Maxx]

Entire armies across the Multiverse went to combat him, but he was only defeated by Brail, using the Rhisling[The end has come...]He was discussed a bit between Brail and the Gobots, some survivors of Mogahn attack on creation[Transformers V Gobots]

He was mentioned by both his creator and Baron Karza He was mentioned By Baron Karza while he monologued to himself in prison[Stellar Oddesey]He was mentioned in "The cosmic Continuum" Baron Karza wrote[The Cosmic Continuum]

Notes:

He’s named after of course, Mogahn the mass

If he is a mythological being in Prysmosian myth, he was referred to as the Beast of Dimensions

According to "The End has come...":

Mogahn is a Pan-Dimensional entity

Multiple sources, including himself, says he purposely destroys 30% of the Omniverse, though it's implied that far from his limit and can destroy all of the Omniverse(easier the Unicron can), but chooses not to.

Mogahn has destroyed at least 30% of the omniverse several times

He is stated to be 0.6 Lightyears long, one Lightyear is 9.46×10^12 km which would make him 5.676×10^12 long(5.676 trillion kilometres long). 

considering that the rest of his siblings are mostly 188,757 km tall, he would be 30070407.98 times longer then they are taller.( in context he would be as long as 4075536.727 Sun diameters put into a strait line).