How to keep the sword of Lily of the Valley stable?

According to Jiuyou.com's inquiry, the steps are as follows:

1. After triggering the corresponding task in the game "Sword of the Lily of the Valley", talk to Oulubad and go back to the town to upgrade the equipment and improve your own strength.

2. Prepare materials such as poison bee's thorn and Fengling feather, and go to the blacksmith's shop to talk to Elsa.

3. After completing the sideline task "Gate of Sanctuary", go to the palace dungeon to find the imprisoned wizard Keynes. The wizard Keynes will provide important information about the sacred stone.

4. Talk to Caint to get news about the sacred stone. Go back to the palace or follow Kent to the cave to find the fragments of the sacred stone.

5. In the cave, find and collect three sacred stones. Get three pieces and go back to the task publisher to complete the task.