Something like one piece?
FIND INSPIRATION TO MAKE A MANGA

Like a treasure finding manga where there r many who want it but only one gets the treasure. Also there r special powers (don't know the power system tho)

It should be like it's a unique item and the protagonist has to train to control and master it. There r other items which r used to fight as well
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I HAVE NO INSPIRATION BUT I CAN DRAW SO HELP ME. IF YOU ARE FRENCH, YOU CAN WRITE IN FRENCH.