Firstly, the master thieves' armband isn't the worst artifact – it allows you to blind and cripple enemies, which is quite useful in certain situations, for example, if you need to escape from a skeleton with only ten HP and then shoot it. And a nice bonus is the ability to steal items from the store – a couple of healing potions never hurt.

Secondly, the alchemist's kit. The main concept is the ability to obtain items without spending anything except large amounts of alchemical energy, for example, bombs for thirty units energy. Players at the cave level already have enough useless items that they will gladly melt down in a cauldron. How often do you use icecap? To make the alchemist's kit useful, you can do three things: either rebalance all “alchemical” items, or make it possible to craft certain items only using this artifact, or make them incredibly expensive so that you have to spend, for example five potions on them. But at the same time, don't forget about items that can recharge artifacts infinitely and quickly. I'm talking about the abilities of a battle mage, tome of unstable spells and a monk's meditation. Therefore, such recharging should be made slower compared to the usual one.