Odd Mushroom

The Odd Mushroom appears in Legend of Zelda: Ocarina of Time. It is part of a trading process for the Biggoron's Sword. Link receives the Mushroom from the Carpenter's son who tells adult Link to take it to a lady in the Potion shop (at the back of the normal Potion shop) in Kakariko Village. The Mushroom spoils very quickly so Epona is needed to speed Link to Kakariko Village. The lady makes an Odd Potion out of the Mushroom which needs to be delivered to the guy back in the Lost Woods.