Je moet voor 1 uniek item trouwens zorgen dat je niet TE sterke wapens bij je hebt. Dat is wel iets om even rekening mee te houden als je alle unieke shit wilt verzamelen.
Het gaat om dit wapen
http://www.uesp.net/wiki/Shivering:Shadowrend
dat kun je dus alleen krijgen als je NIET iets in je inventory hebt wat op dat moment al beter is.
edit:// omdat je niet naar de wiki wilt even een klein stukje wiki in een spoiler
How to Get It
Shadowrend is obtained in the quest Symbols of Office. When you reach the Grove of Reflection, you will have to battle with a shadow version of yourself.
You must retrieve the blade/axe after defeating your clone, but he/she will only drop it if it is the weapon equipped and unsheathed. It would be easier if you silenced the clone to stop it from summoning a weapon, and so preventing you from collecting Shadowrend (and use Dispel to dispel any summoned weapon, or wait long enough for the Summon effect to wear off). It helps to save before you fight your clone, in case it does not drop Shadowrend. However, the Skull of Corruption glitch in combination with the Staff of Worms may be used to retrieve it.
Your clone possesses all the spells you have, and if you are wearing invisible armor, it too will be invisible.
If you have a weapon in your inventory that the game considers better than Shadowrend, then the clone will use the other weapon and not drop Shadowrend when defeated.