There's a lot of things you can get, And the rewards vary slightly per rank. By slightly I mean you just get more of said reward. (But you're stuck with lowest reward until you hit 6 paths atleast once). Here, I'll lay out what I do know

Common-various ninja, primarily 5 kage treasure commons like... Ao, Kurotsuchi, Akatsuchi, Torune, Fu, Mabui, maybe Cee and conference Temari. GNW Ninja like gnw sai, gnw sakura, gnw kankuro, the such, and Wind Blade Asuma and BS Kakashi.

Rare-5/6 of the pains, the one that isn't here is (obviously) Tendo. I have heard rumors in the past about people getting 5kage treasure rares as rare, but I have yet to see that for myself. Anyone else can feel free to debunk this, or to prove it.

Seal frags-5 at lowest, 60 at highest, which in seal scroll standards... 0.5 at school student, 6.0 at 6 paths.

Jib Edit: Not to worry! I have already removed the duplicate post. Thanks so much for your help =]

Not this agai-