As many Zelda games do, Book of Mudora features an optional trading sequence that will result in a quest item that will make your adventure easier. Here's a general rundown of the trading steps:
Odd mushroom obtained in the Faron Woods
Odd mushroom made into potion by the Ordon Potion Shop
Odd potion traded to the Dekus for a Deku Mask
Deku Mask given to the Zuna in exchange for a Moon Tear
Moon Tear swapped for a Crystal Ball by the witch in Saria Town
Crystal Ball given to Impa who returns some Tasty Meat
Tasty Meat given to a Moblin who gives his only possession, a can of Dog Food
Dog Food traded to a Tokay in exchange for some Bananas
Bananas swapped for a Goron Vase by a Goron who's tired of eating rocks
Goron Vase given to a Zora collector who gives a Zora Scale in return
Zora Scale forcibly taken by a Zora in Rito Town who gives a Frozen Fish instead
Frozen Fish given to Isan who exchanges for the Culinary Arts of Hyrule book he's been reading
Culinary Arts of Hyrule upgraded to a Rito Feather by a grateful citizen of Septen Heights
Have fun on the quest and enjoy your prize!
Hi, where do I find the Zuna (step 4 of the list)?
Does this Rito Feather allow to fly? I get the feeling some floating items (hearts at palace entrance, and even enemies at the Grave Palace) are only accessible by flying.