What "shards" do?

[Yorick_theReal]

Hi everyone, I can't figure out what I can do in Survival with the shards obtained by voting keys. Any help? Thank you very much and greetings from Italy

 

[iDEVILEVIL]

buying stuff from wizard shop every Saturday and Sunday

 

[Yorick_theReal]

buying stuff from wizard shop every Saturday and Sunday

Thanks a lot! This weekend I'll try.