Yea having the same problem as well it is quite odd cause the achievement showed up in the ls history of achievements but not in each individuals history :/
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From what Hyuga has said, sounds like it spawns with ~10mins left. Sounds like its one of those Undead Mage mob types. I've never seen it as we usually try to finish as soon as possible.
yeah, i know the mobs stop spawning after 13 minutes left, guess we will have to see what it takes to survive all that without it getting too sloppy and see what happens while holding boss longer to see if that helps drops at all
we will figure out this drop system better damnit, to this i swear lol, there may be more to it then some realize
and im also starting to think the drop table may be based on which NMs you kill(the extra point kills in general) instead of score itself(score may increase drop rate of said items?)
Iv'e tried everything to get that 5000 point mob to pop. Kited the boss around until under 5min, no luck. Kited the boss and some of his adds around until under 5min, no luck. No party or militia deaths combined with previous two ideas, no luck. Tried killing the mobs in different orders, no luck. It must have some sort of retarded spawn condition that I haven't thought of trying yet.
Link to full size cuz that's kinda small: http://cloud.steampowered.com/ugc/57...961F5CD261A87/