The legend of the knight

Kuznetsov gives you a tip-off to a mysterious sword in a stone located in Undiscovered Land.
==Walkthrough==
The sword will be marked on your map. It's stuck in a huge boulder that is hard to even climb to. You can reach it by jumping on the slope shown on the picture below.
Attempting to pull it out starts this quest, with a tip that you need an artifact enhancing your strength, such as Mushroom.
Find the artifact and put it on your belt. It will be consumed and degenerated into a Cobblestone afterwards.
==Notes==
* One place to find a Mushroom is Collector's stash Radar 3. There are two such artifacts in the game, so you won't lose Kruglov's chain if you need it.
* This quest is better to be left for the late game, as Mushroom is a great way to improve your carrying capacity.
==Bugs==