you can repair your artifacts in a Blacksmith, which is a building you can only build when you reach Level 6.
Till then, we recommend that you sell and re-buy your items, though it's more preferable not to use any items at this level since you don't really need them to win. Save them for later levels when you DO need them.
Repairing also does not return an artifact to maximum durability. Depending on the skill of the repairer, repairs can only restore 10%-90% of maximum durability |
