After each battle there is a chance that a treasure chest is going to be discovered in one of your allied territores. A treasure chest can contain any random item (the armor will be race specific). There is also a chance of finding 1 or 2 Crystals in the chest.
The treasure chest will only appear in a territory for a day and will no longer be there once that day ends.
Finding a Treasure Chest
Territories with a found Treasure Chest will shimmer with a golden color