It means that the champion has been empowered, meaning that this player had a duplicate Scyl and essentially fed it into an existing Scyl to give it a permament stat boost. 

https://plarium.com/forum/en/raid-shadow-legends/843_news/31063_update-4-90-highlights/

More details can be found in the link above. 

Thank you! 

You're very welcome. 

If you ever have any other game questions or just feel like chatting about Raid, come join us over in Game Discussion.

fed it into a duplicate player ???  ummm that supposed we - I  - know how to do that ? usually that just upgrades  the player in the tavern  , would you have any tips by chance,- how to do that PLEASE :-)

oops i for got  to mention thank you so much

It is done (I believe) in the sparring pit. Can only be done with high level champs like legendarys

to do so in the Tavern will only upgrade the skills

to do so in sparring pit will empower the champion

ugh. Xena wasted. I had no idea of this.

what happened?