Board Thread:Lore Discussion/@comment-15888551-20130823092654/@comment-10207438-20131222221808

the blades from oblivion held to their service to the dragonborn as their motive and creed.

the current blades lost that motive and chose to go back to an old motive of destroying the dragons and even abandoned their loyalty to the dragonborn by attempting to make him kill a dragon he wouldn't want to, these blades are nothing more than violence driven mad men.