#Speak to [NPC] Archaeologist. He will give you a quest that must be resolved first before giving a key to get into a secret room located in the middle Esdelron Lake.
:Image:Archaeologist's lost glasses.png
#Then go to the warp in the middle of the Arena Zone to go to the area where you should look for items that are requested by the NPC Archaeologist.
#Once you get into the warp in the middle of the Arena, then you will arrive at a labyrinth. In this area you have to look for a pair of glasses belonging to NPC Archaeologist. You can find these glasses by hitting each box that is in the area.
#When you've got these glasses, hand over it to the NPC Archaeologist and he will give Esdelron Key, which you must show to NPC Esdelron Patrol to enter the secret room in the middle of Esdelron Lake.