you must make yourself less popular
You've got to be over level 15 and offer nightshade to the shrine.
valus mountains
The shrine of Hericine i think
mostly near azuras shrine or in the blackwood forest ps you need to be over level 2 and you need a silver weapon or daedric or a simple killing spell to kill them!
For example: Summon scamp, summon dremora, summon skeleton, bound dagger, bound shield...
finish all the deidric shrine missions
Dark Fissure is West of Vaermina's Shrine.
Yes it is a mod, but is it a fun one
the wabajack u get it from shrine sheograth
You collect the five water stones, then go to the shrine and summon it.
If you are getting it for the daedric shrine quest there should be a will-o-wisp sowewhere close by the shrine. you need to search it for the dust.
its not a key but a lockpick. it never breaks.it is in the nocturnal shrine quest