This bug wont let i complete the task, even if i got all objecti done

please take a screenshot of how you're gearing your champion - with screenshot of the glove, chest and boots. my guess is one of those three pieces are flat attack and not attack %

I have 10 characters using this same set 

and another i tryed as 2 photo

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Hey there Tyffany,

You are a little confused on "what" you need to equip. It is NOT the Atk 15% equipment that you need to put on. What you need is Atk% as the Primary stat. Look at the yellow circle here...

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The reason that weapon, helmet, and shield are not included in the mission is because their primary stats are always static at ATK, HP, and DEF. However for gloves, chest, and boots, their primary stats can be different such as Crit Rate, Crit Dmg, HP, HP%, Atk, Atk %... (ect.). So, the Primary stat has to be Atk #% and NOT just Atk #.

I hope that helps.