When playing EX PZ RPG you will randomly find chests that can contain all kind of different things. To open each chest you’ll need to purchase a key from the Shop which cost Gems. Often these keys can go on sale and can be bought for much less than the normal price.
Where are the chest you ask when they drop in battle? If you have the appropriate key in your inventory when the chest drops than it will be unlocked automatically. If you don’t then the chest is lost forever. It’s kind of a bummer if you ask me and the developers should let them build up in the inventory so we can open them like normal people.
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Chests will usually have to same quality as items which include Common, Uncommon, Rare, and Epic. Gear can be upgraded to higher than epic where it becomes a Relic.
Low quality chests are really just a waste of gems and they should be spent more important permanent things like increased inventory space. Your only going to get the same quality item which will be no better than the rest of the stuff found as drops. You can often buy gear in the shop that much better than the stuff in chest and you’ll know what it is before purchase. The whole system seems to be on the silly side and thrown into the app for something else to do.
Where these thins really start to shine is when you at a high level. Then the cost of keys will be much less than it would be to purchase the same item. If you do decide to blow gems on keys I would wait until much later in the game where you’ll get more bang for your buck when it comes to items in chests.
Moral of the story is don’t stress over these as gems can be spent much more wisely. If there is anything you would like to add that I might be missing feel free to mention it in the comments below.
It might be too later for you to start over, but here’s some info on the Best Class.