winter wail

Good day all, I am having an issue regarding The Undergrove and the bridge in the secret area. I got the Winter Wail and started the Path of the Deer quest. I made my way to the altar and touched the sword thus spawning the dragon and eventually the bridge was available to me and I cleansed the...

So I was up in the Elder Forest when I initiated the quest and I found out from a YouTube video that I needed to get the Winter Wail sword. The issue is that I had already been in the lair that contained the sword and I had defeated the boss. I know I did not take everything from the chests or...