Valhalla coins
I would still recommend you build Alchemy Lab for emblems ( shards → emblems )
The loot box unit pricing on Hero Academy is pretty bad ( see notes )
This is most likely by design, since Tavern of Legends coins can only be used on that summons, Atlantis coins on that summons, Costume chamber keys on that summons, etc. ( SGG how many gorram frakking summons tokens are you going to give us to avoid giving us more gems? )
In my option, you are better off collecting Valhalla coins / Epic Hero tokens to get new heroes/ HotM ( see notes )
Notes
Click for notes
Hero academy
Valhalla coins
Valhalla loot box unit pricing
Old post.
The loot box unit pricing has increased significantly.
Next time I update I will include coin values.
FIN