Uranium235
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I want to believe that it's about the Fragment of Worlds. But I'm not an expert.
It's quite possible that it is. At least, there are not many doubts about Fritjof and the two checkers, but the role of the last world and who it belongs to now depends on a lot.
Do you see the cook having protection against starvation? Yes or no?
Now, combine your two "yes" answers into one picture.