Hey, this is a cry for help. I needed 4 champions to complete the challenge. The progress bar started with a value of 2 which is rare, beacause a got many more meeting the requirements.

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 So i equip an unuse heroe and nothing.

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 I went to several forums to see what is wrong with this challenge, and with many others in the same situation, i got that it only works with newly adquired heroes. After doing that i raise the progression bar on 1.

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Note: i took out the shield later on, i dont have a picture with the shield on, but then it counted as a progression

  

 Going for the fourth, It did NOT raise. Maybe you cant upgrade de artifact outside the heroe??? 

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By now i really got no clue what is wrong, and should not be that complicated to complete this.... so i took out the items of my only succesfull try, and put them on the other heroe, and the progress bar went back to 2. So now im back where i started, spent over 1.5 m coins and run out of 3* stars artifacts to try anything.  

Can we expect any kind of solution to this problem or we just go and read a book?  

Btw i loved the game so for, is supper addictive