Can't get the mission XENOLOGY is it the BUG？ November 15th i canceled the mission XENOLOGY Two week i can't get the mission XENOLOGY from xur use warlock even can't find the mission XENOLOGY in the quest archive The exotic cypher is used Achievement gives one exotic cypher, at that time, I had taken over the XENOLOGY mission. With this mission,you cant take and used achievement exotic cypher, so i canceled the mission on November 15th. I think xur will come with a mission again, but It didn't.