Slayer family bonus didn't stack

In raid began at 22 November 2021, I used three heroes of the Slayer family but the bonus didn’t stack in one of them. So when the others reached stack 7, he was still in stack 2.

Have you used 3 Unique heroes ?
Or there were some same heroes in those 3 ?

3 Unique heroes are needed for 100% stack chance.


Ok thank you. You 're right, I used two same heroes.

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