All items in Revelation Online, apart from bracteates and amulets, can be upgraded at the blacksmiths with sharpening stones. There are a total of 16 sharpening levels — the higher the item level the more levels available to it. Each one boosts item stats by several percent within a specified range (for example, 2%-5%). The chances of successful improvement depends on the amount of resources invested and it can be brought to 100%. But the result of the sharpening remains random. Each upgrade level can be attempted again to obtain a better result. Repeat attempts are carried out separately for each level an unlimited number of times.