I am not sure what you thought imeant , most commonly used as in onus of truth , the burden of Truth.
i thought it meant what it means in English (my native Language, btw, despite the Germany icon (where i live) in my profile): "the onus is on me to prove that..."
i.e. the burden or responsibility [typically of proof/proving something]. That doesn't seem like a appropriate title for this game, though.
However it does have that wider meaning.
Perhaps ask Draco?
That was the intent of this post . Draco listens in here.