How I think Dark knight should be addressed. First make Dark Passenger cost no MP, with this simple change it will allow Dark Passenger to be used on single enemies making it a dps increase overall. Second give Dark Knight a new trait in which each blood action such as Delirium, Bloodspiller, and Quietus will drop 5 seconds off from your blood weapon cooldown. This change is similar to Warrior's Enhanced Infuriate trait and in my opinion would be a great buff to Drk's damage and fun factor. Third give Shadow wall a 20 second duration, this change is inspired by looking at all 3 tank's highest defensive cooldown. Since Vengeance 30% mitigation is 15 seconds and is the fastest of the three at a 2 minute cooldown, Sentinel 40% mitigation is 10 seconds and has a cooldown of 3 minutes, Shadow Wall 30% mitigation should have a 20 second duration because of its cooldown being the same as Sentinel's but with 10% less mitigation and it doesn't have a 55 potency per each hit like Vengeance.