Ultimate OwOblivion is the end, the ultimate, the final. It is like LVO to SVO when compared to Utter OwOblivion, and shares Utter OwOblivion's immense magnitude. It is defined as follows:
Take N to be the N used in Utter OwOblivion's definition, with the addition of Utter OwOlivion:
Level 1 is N{⇴}{⇴}{⇴}...N{⇴}{⇴}{⇴}...N... where {⇴} is the ULTIMATE Y1FF operator, and every ... signifies Utter OwOblivion recursions.
Take this new creation to be N, and repeat the process. Then this is N, and so on and so forth you repeat this process, reaching new levels. Once you have reached Level Utter OwOblivion, you will then reach 1Level 1. You then repeat the entire process again to get 1Level 2, then so on and so forth. Once you reach 1Level Utter OwOblivion, you then reach 2Levels. You repeat this process until you reach Utter OwOblivionLevel Utter OwOblivion, which is Ultimate OwOblivion. That is how large Ultimate OwOblivion is. It is incomparable, it is the last. By definition, literally and absolutely nothing can surpass it.