hey three rings you should have this invasion event each 2 months or so.I think the invasion includes npcs attacking haven.the npcs should be called dark knights or something.you open up the way out of haven (south).then you can fight and get good material or some crowns or even crowns.if the npc is called dark knight they should be able to drop night blades or something chances shud be like 20% or less.people who at least got to tier two should be able to do it because newbies will die easily.
Posted this on my iPad sorry for the bad spelling.
About the night blades I don't know if it should be dropped by them
Um, hey, ya know there is already a thread on something like this, although it involves random boss attacks on Haven. Maybe you wanna post your ideas there?
The link is: http://forums.spiralknights.com/en/node/17692