Hi Raid,

I have a sugestion about duplicate system,

If its possible to open an Exchange Bank, there you can exchange your duplicate champions to books or silver or to the same shard from that was pulled the duplicate with applicable rules to be a duplicate

Lets say

Legendary duplicate to exchange to Legedary X books , or exchange to Sacred shard,  or X Silver 

Epic duplicate to exchange to X Epic books or Epic shard or X Silver

We have in game already there you can use your duplicate as a book but is just for the same champ ...

To give back the shard hmm , finger crossed to summon him

Silver has to be good amount ))

 Don't know if will work for you and us, just as a sugestion.

Regards