Return of Reckoning

There is a place in Tier 1 that drops purple chalice and purple warrior priest books.
The mob that drops it I believe is in Emp but I could be wrong. The item is called Chalice of the Interloper. Here is a link to the items stats.
http://www.warbits.com/gold-items-6634-Chalice-of-the-Interloper.html ...