Hesed of the Black Anvil Guild:
To return the golem, my assistant Grimnir has sneaked into Lurin's secret workshop.
Go there and help him.
If you succeed, I'll teach you how to use our new technology.
However, keep in mind that you can only take this task if your level is 105 and higher. Also, you must do it by yourself, without anyone's help.
Go to Lurin's Secret Workshop (Lv.105+) Return to start