The world god considered her words and said, "Now that's believable. That's how you tell a believable lie. You even almost got me, but I am too experienced and can spot a scam from half a light-year away."
So Legion-0 said, "I swear it on my Supreme law and world that what I said is the truth, and you joining it will cause no repercussions on you. If what I said doesn't come true, then my Supreme law should scatter, and I should die forever."
The world god was taken aback by his oath. It was the most serious oath, and it meant that this strange world god was serious about its proposal. It meant that it might not be a scam after all.
The world god wouldn't have believed it if Legion-0 hadn't sworn that she was telling the truth. What's more, she swore about the thing he was most concerned about, which is the repercussions of joining this network artifact.