(Lowkey first post! Whoo!) WARNING - SPOILERS

In the book, it is initally discussed that the Cataclyst is the most destructive artifact in the entire OASIS, and went up for auction to later be purchased by a mysterious buyer for a record high price. Later, it was shown that the Sixers had held on to the artifact until they needed it most to stop anyone else from completing the last Gate and taking control of the OASIS. They were stopped, much to everyone else's praise.

But, if the description and idea behind the OASIS is what I think it is, the Cataclyst isn't the only weapon to dish out that level of destruction, and may not even be the most powerful. I wanted to ask all you experts in the OASIS, what do you think is the single most destructive weapon, system, item, or artifact is in the OASIS!