For this quest you need to get a Blazing Crystal in the Scorched Rift area. For this you have a detection device. The crystal can be found when you find a pot on the correct location. However, there seem more locations possible even tho the detection device can say you found the correct location. Sometimes changing channels helps.
I could find my Blazing Crystal in a small pot on the ground at 30.8 / 49.8 (channel 1)