Shaman is about finding your true inner-self - hence its faction name "True Sprint" - then they recycled that faction for the few original epics, such as SK (this is how you can tell what epics were developed by who and when) the TS ones were the "first" ones they made and worked on.
SK one is fairly good, the quest to corrupt a holy weapon (ghoulbane) is cool and all, but it then leads to much darker things were people then would use that power to resusrect the "first" shadowknight, Llharc (or whatever) and if this was allowed it would lead to lots of bad things... so you go on the this quest to get all these armor and other items to be able to resurrect and bind him to stop this - the will of innorukk BP, head of the valiant earring etc. etc. then you give him the stuff because he is like "I was just using those dudes to get me shit, that stuff they thing is going to bind me is just going to ressurect me and make me stronger, help them out and really help me out and I will show you Innoruks Curse" your like "sweet" the sword that innorukk himself made for the first human empowered with the might of the shadowknight could be mine!
Well, the dude gets all this shit and is like "lulz, HERE IS IS! IN YOUR FACE!" and you have to kill him - stopping his return and the plauge upon the land that he and his followers would have brought about (the old guard SKs that wanted him back got betrayed by llarch and the new guys who then killed them all for their shit)
So you kill him and LOOT THE SWORD - who needs dangerous MQ's hand ins, when you can just let a level 1 SK loot the sword