The silver keys which were saperated into 4 pieces, sealed in an anchient sanders wood box. In legand it would open the entrance that leads to the valley of spleeing fairies:
1. the enchanted crystal which has rune carvings for the first seal
2. silver scythe, used only when penumbral eclipse occur,when the shadow of the moon projects on the crystals of the larger key would open the another seal
3. marrow of the dragon, white smith melt the marrow of the smallest draon in to this smaller silver key. when turning the gear wheel on the handle of the key another seal is opened
With the aboved 3 items, used the certain order, people would open the entrance of the valley, but...
If lack of the 4th, even with the aboved 3, people would be lost in the labyrinth of the valley and could not be found
4. the soul of the sleeping fairy trailhead, need secreat sarifice to awake the soul that sleeps deeply in the mummy of the fairy trailhead