In order to begin this quest, you have to get to the Temple Of Amadia. You will need the ability to teleport to do that.
1. Temple Of Amadia - first altar
2. Temple Of Amadia - second altar
3. Temple Of Amadia - third altar
4. Temple Of Amadia - fourth altar
5. Temple Of Amadia - fifth altar
Temple Of Amadia is in the clouds and is full of traps. Right next to the entrance, you will notice Amadia Face Door. To open them, you will need the crystal that's on the outmost "island."
You can pray there to Amadia, to get additional effects.
Your primary task is to free the Knight Of Amadia. This requires the ability to teleport. You will have to find each of the five altars to do that. Go to the tree trunk joining the two "islands" right away.
From here, you will have easy access to each of them. After activating every altar, the barrier will disappear ad you will be able to talk to Knight Of Amadia, thus ending the quest.
Reward: 20075 experience points + Knight of Amadia Gloves