Can I reroll my attributes?
Yes, you can reroll the attributes of an item to change its stats.
However note that 3-star items have an unique perk which you cannot change.
How to level up:
You can level up your items by collecting enough Gold and clicking on the level up button of the specific item.
If there are more than 5 levels of difference between your highest level item and another similar one, you can perform an instant upgrade by paying 10 Gems.
This will level up the item you have selected with a lower level to the same level as your highest level item.
I opened a chest, where is my item?
You just have to go to the Knight Menu, then "Collection".
There, you will be able to see which Chest provides which item and which floor is required to unlock the Chest.
Can I buy items?
You can buy items via the in-game shop. You can access it by pressing the Shop button, the offer button which appears at the left of the screen when new offers are available, or by tapping on the Gem icon.
In this shop, you can buy Items and Upgrades.
Below this, you can purchase Knight upgrades with Tokens, and Gems for real money.