Stefan at Ebon Watch wants you to take the Writhing Choker to Bloodrose Datura.
1x Choker's purpose exposed
It was either wisdom or luck that prevented you from wearing this choker, [race].
Either way, your acquiring it was no random occurence. You've been targeted by someone, or something....
Take your choker to Bloodrose, here. Let her demonstrate the fate that nearly befell you.