After finding a note concerning an odd rumor, the Nerevarine travels to the Altar of Thrond. Once there, the Nerevarine encounters Ettiene of Glenmoril Wyrd in the form of a raven, who offers this note as assistance.
The Coven wil [sic] remember your dedication and service. We realize Solstheim is an inhospitable place, but we go where we are needed. Anyone seeking the cure must perform the Rite of the Wolf Giver, of course. But I do understand the sensitive nature of the ritual, and realize it may not be possible to perform it again and again, if the Lord Hircine claims more than one soul.
So, I have prepared a Scroll of the Wolf Ender. The Daedric lettering on that scroll contains all the power of the ritual itself. I have taken great pains to prepare the parchment, and it will work as well as the Rite of the Wolf Giver. But heed these words! I do not wish the scroll to be used unless absolutely necessary! It was not easily created, and it is the wish of the Coven that it be saved for future use if possible
The scroll has already been hidden in the gloomy cave that will serve as your hovel for the duration of your stay on Solstheim. It is inside the hollowed-out icicle that hangs from the cave's ceiling. You'll need to use your raven form -- or a potion of levitation -- to reach it.