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Do i need to skill trial and spend 4 experimental protection?
Also i wanted to skill trial the mystery but didn't found no skill, can the skill not upgrade as i was not enough lucky?
You have to temporarily go back to the +1 version, then use fragments to upgrade to +2, after that you can switch it back to Y2
Go to skill trial
Below there will be a option of select skill
There you can choose +1 instead of y+1
Then that skill will be upgradable through ninja fragments
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