I have both a quest that's from a mod and a quest that's from the Dark Brotherhood.

First is "Whispered warning" that lets you keep the old sanctuary members alive. It worked and it said it was successful but it won't leave my quest log.
The second quest is "Darkness Eternal", the quest about Vicente Valtieri offering to turn you into a vampire.

I can't get either one of them to leave the log. Darkness Eternal can be done but then I'd become the vampire and have to go on the quest to heal myself.



So my question is, Is there a mod that lets you delete quests completely from your quest log? Any help is appreciated.

In the normal course of the game Darkness Eternal would have been removed once Valtieri dies. You can try using the console to complete it but I'm not certain whether it'll break anything.

setstage DarkVamp 115

Don't know about the mod quest, could be how it was set up. Think there isn't a mod to delete quests, but I could be wrong. Closest thing is http://www.tesnexus.com/downloads/file.php?id=32266 by TNO, allows you to hide quests. Probably safer approach than the console method.

I thought Whispered Warning ends once you visit the Night Mother and get the first set of orders. I don't think it ends completely until the spared members return to the sanctuary, but I thought it did end eventually. I'll be getting to that point soon in my game, but not there yet.

I usually just leave Darkness Eternal running. You might be able to end it - I'm not sure what effect it would have on Vicente's dialog. Should be ok. This time I didn't even get that quest since I was a vampire already, so you might be able to stop that quest with no ill effects. Or grab TheNiceOne's mod like omeletted suggested.

Won't "CompleteQuest DarkVamp" just move it to the "done" pile, without any other effects?