Sharpening allows you to increase armor stats from 1 to 10 for each possible position. A chest with a random sharpening will be added to the store as part of the Global Event.

The Chisel and the Enchanted Smith's Chest with elite sharpening are added to the precious chests and rare chest as rare items.

The rare precious chest now has an equal chance of dropping any rare item (when chests have a rarity tier - the rarer the item, the lower the chance of dropping). The chest can now also be purchased with a rare certificate.

The tenfold emerald chest now has a 100% chance of dropping a rare item if 400 such chests are opened. That is, if for some reason luck is not on your side and a Rare Certificate does not drop, then on the 400th chest, it will definitely drop. You can track the number in the character's stats "Emerald Chests Opened". The stat does not have an expiration date, but is removed after a rare item is obtained.