General Discussionwhat chests are opened with old keys

Any hero themed chests like Axe Furion Sven etc. are opened with old keys. Some of them drop modifiers which actually worth a lot but are very rare.

Bitch
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On serious note: hero chests

"what is most advantageous to open"

nothing, trade keys for items u want

The treasure of rarities, the newest unusuals are worth the most