Beltrame

Beltrame is a character in UnderMine, they are on a quest of their own, and the peasant can help them find all of the Artifacts for their mission.

Mushrooms
can be found in a room with Matsutake and some enemies. After clearing the room, you receive the mushroom by talking to Matsutake.

can be found in a room with a sign that implies you to destroy all light in the room. When the lights are off, the mushroom will appear. If you are on this quest and the sign in the room is broken before you read it, destroy all lights to make sure whether or not the Nightshade is there.

can be found in a room with a blown up ground, which creates a circle and a normal mushroom in the middle. Blow up the middle to reveal the Blastcap mushroom.