Finding the Phylactery

No time for small talk, <name>. I was sent on what was to be a suicide mission to take this ziggurat. I've accomplished my duty as a soldier, now is the time to get some answers. This lich has knowledge I seek, yet I cannot inflict pain to his physical body to obtain that knowledge. The lich stored his soul in a phylactery, and while it remains hidden, I won't be able to pry the information from him. Return to the camp and take my horse, Dusk, she will lead you to the phylactery. Bring it to me.