Combine hero empower mats

Hi there,

I'd like to suggest to add "combine" for hero empower materials.

• Holy Crystals > Holy Feathers
• Holy Feathers > Artifact Holy Feathers

In particular the Holy Feathers in the inventory are useless as they are only suitable for mythic heroes. Holy Crystals can only be used on the Main Character up to level 15. From level 16 Artifact Holy Feathers are required, for the Main Character the Holy Feathers are skipped.

Thank you in advance, for passing this onto the right department.

Have a nice day.