What's the use of pickup hall ghost mushroom?

Question 1: What's the use of ghost mushrooms in pickup hall? Hello! Ghost mushrooms seem useless now, but they may be useful in the future.

Question 2: What's the use of ghost mushrooms? Shadow Power Potion: Ghost Mushroom (3), crystal bottle to buy.

Limited invincible potions: blind grass (2), ghost mushroom and crystal bottle.

Poison to kill the devil: Grom's blood, ghost mushrooms, crystal bottles.

Phantom dye: Phantom mushroom (2), purple dye, crystal bottle factory.

Invisible potion: ghost mushroom, sun grass, crystal bottle

That's all I know. The SS Thousand Horses mission upstairs requires ghost mushrooms to be used as "shadow power potion". I'm not sure about other tasks.

Question 3: What's the use of picking up ghost mushrooms? Hello! Ghost mushrooms seem useless now, but they may be useful in the future.

Question 4: What's the use of ghost mushrooms? Shadow Power Potion: Ghost Mushroom (3), crystal bottle to buy.

Limited invincible potions: blind grass (2), ghost mushroom and crystal bottle.

Poison to kill the devil: Grom's blood, ghost mushrooms, crystal bottles.

Phantom dye: Phantom mushroom (2), purple dye, crystal bottle factory.

Invisible potion: ghost mushroom, sun grass, crystal bottle

That's all I know. The SS Thousand Horses mission upstairs requires ghost mushrooms to be used as "shadow power potion". I'm not sure about other tasks.