The 45th Dimension is located in the intercollestial star system, and the main activities of Av-Matoran Studios happen there.
Differences from the 1st Dimension
In the 45th Dimension, when Hapori Dume tried to overthrow Hapori Tohu, he was killed. Two of the Toa Hapori, Matrak and Kazu, also perished, but were not killed by Dume. The Ninja war never happened, and Hapori Tohu rules in harmony.