The Assassins blade quest needs to be fixed. (Noticed this when test playing this quest with my editor). There is un-expected behavior at the end of the quest, it really needs the tag <QuestEnd>1</QuestEnd> on objective 6. (Otherwise one get unexpected behaviour from this quest).

Furthermore, I suggest for objective 6 that maybe a return to quest start location be another condition added to the quest.

I ran the quest on a map that forced it to spawn and I couldn't finish the quest even though my only character was using the blade. These changes should fix the problem. I'll post up a new version of the quest if you would like.