To use the elevator, Telas will require 25 iron ore.
You can get iron ores from mining Iron nodes (Mining Level 20 Required).*
Once you do, you have access to the elevator.
Enter the Worker Golem spawn.
If you pass through the room with the Worker Golem, you will find a staircase.
On the lower floor, a mini-quest awaits you. Along the way, you will encounter War Golems, which are significantly stronger than Worker Golems.
Recommended level is 80+ or 60+ in a party.
At the end of the path, you will find a quest chest with a reward.
There is a second quest behind the closed doors.
To open the doors, you will need a Teleport Crystal.
It has a small chance of dropping from Worker Golems.
Once you have obtained the crystal, speak with Telas near the doors.
Hi - Mission - Crystal - Yes
Behind the doors, you will encounter a large spawn of War Golems and another quest. Recommended level is 150+, preferably with a party including a tank.