The Tyran Cluster is the main universe in the multiverse.
There is at least one distinct splinter timeline, named Decepticonia, branching from the events of the prime universe.
In-universe, the prime continuities are collectively referred to as "Tyran" in the TransTechs' universal stream designators.
This continuity encompasses all events of the main universe of BIONICLE, Transformers, etc.
This takes place in a splinter timeline where Megatron won the battle of Mission City.