Collect Inferno Books and Twill Mugworts from the Fire Tower Forest and buy some Luch Eggs (five is best) from the Kikinak Company. Then, enter the Wind Patina Forest and take a left to the second Ogre Vine. Inside is a plant that merges items. Place the Luch Egg inside, then place the Inferno Book or the Twill Mugwort in. Do not place them in the reversed order or you will not get anything good. Save the game before doing this so you can reset and try again if it does not work the first time.