The Fun of Firefly forest

About
You have to go through a lot of challenges to earn the Firefly Gem. When you go to the boss battle with Gerald, you need to battle viciously to break the shadow spell that the Puppet Master put on Gerald.

Summary
After you break the spell on Gerald, Noot transports you back to the main area, where Flora is all the time. Then, Flora gifts you with the Powerful Plant Relic, and the Firefly Gem.

Tips
Using fire may help, as fire is powerful against plant.