BIONICLE World says that in the early days of the MU, Artakha and Karzahni competed for the right to wear the Mask of Creation. What was the nature of this contest? Did they physically fight each other? Was it a game of wits? Was the contest held by the Great Beings?
It was probably a building contest.
That would explain who won!
It was a joke because Bionicle building contests were a thing, but you knew that.