How to open stone frogs in Mortal Shell

As you progress through the game, you will find several locked chests in the form of stone frogs. We'll show you how to open them.

There is an Old Prisoner in Fallgrim's Tower. This is a story character. He will ask you to bring him 3 glands from three different temples. As soon as you get to the first of the three main bosses, after his death you will receive an iron. Leave the temple and you will see Folgrim mired in mist. This fog removed all the robbers and familiar enemies from the location, but populated it with some kind of bloodsuckers.

But it is in the presence of such fog that stone frogs become active. Interact with them to open chests. Some contain common loot, may also contain jars of quenching acid, but somewhere there is also a molded spike needed to upgrade a consecrated sword!

Please note that as soon as you give the iron to the Old Prisoner, the fog will dissipate. However, another character will appear in Fallgrim's tower. For 1 glow, it will activate or deactivate the fog.