I think it's not a good idea to give both the "striking sword" and the "killing blade" skills at the same time. These two skills work under completely different conditions and were originally designed as opposites (one is good in one-on-one combat, the other is good against a large number of enemies).
For a high-level creature of the "Inferno" faction, these two abilities complement each other very well, creating a creature that is very difficult to defeat:smile25: