Talk:Walkthrough/@comment-85.76.22.188-20190112123202/@comment-77.20.248.37-20190112160247

For Seath to go to the Ash Lake and leave his lord soul behind you have to have the "crosbred dagger"/priscilla dagger (found at the bottom of sens fortress in a chest after the 3 titanite demons) with you (not sure when the trigger exactly is but probably when you encounter him the first time at the top of the archives/going through that fogwall)

Havels Quest has nothing to do with Seath but with the everlasting dragon: If you don't do the Seath Quest and just Havel, he will sit at the bonfire of everlasting dragon, having killed him;

Doing just Seaths Quest and not doing Havel/ killing him lead to Seaths going to Ash Lake and just mouring being non-hostile

Doing both (progressing Velkas Questline) will lead to Havels Armor and Ring on the path to the everlasting dragon and seath not being there (presumed death by Havel)