Bug: I noticed that some items do not display the correct graphic when thrown for example. Or differ in your inventory. I did not exactly keep track which ones, but if you have not caught them yet I can keep an eye out and report them more specifically.
Idea: Perhaps for the very last floor of a season there could be a guardian you have to defeat who drops the orb. This guardian would be the winner (only by name, an NPC) of the previous season, with the same/similar items/strengths/health.