Developer Q&A #2 - Chronicle 5: The Oath of Blood
The official site for Lineage II has put up the second developers Q & A. You can even get a look at some of the concept art on the drawing board!
Dashammer: Will the special ability Might Mortal ever be actually removed from all present daggers with the SA?
Lineage II Dev Team: Hello, Dashammer! The Mortal Strike (previously named Might Mortal) special ability made the dagger classes too strong and this change was made to balance this issue. But we are not planning to remove the existing daggers with the Mortal Strike special ability. We will leave them as is, rare items.