I know there were some similar posts but I thought about a rare event where you get a weapon similar to ch 317
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Something like this:
-Every 3 DK (beginning from Jounin upwart) your chakra can get an element by chance
->to find out you need to purchase this indicator paper (e.g. in a special misson)
->This tells you what chakra type you have
-Then there is a really rare event, like you fight some beast and rescued s.o. and he/she is giving you a special weapon if you help him/her getting home
->More beasts
->finally you get 1 of 5 weapons (fire, wind...weapon ... maybe with special names)
(1)Wrong element--> you can sell it for some gems and gold (maybe a good price)
(2)right element --> good weapon (lvl15+3) attack but activation of special chakra attack (norm. attack +7) consumes chakra
-->After your next DK you lose the weapon again
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Only had this idea yesterday and thought IŽll post it today