The exotic sword quest has been working fine until the kill percentage part. The kills I am getting with my Nighstalker abilities are not registering anymore, in other words, my progress is stuck at 30%. Being that this is a quest I intend to complete, I would suggest that this issue needs to be addressed and fixed. I've also heard similar bugs with the "Jolly Holliday" quest where kills while the last word is equipped are stuck at any percent and not progressing. If you've experienced a similar issue with quests bugging out like this, post it here. Get it noticed so we can get it fixed.