Ebony blade is bugged? How please.
It's a two-handed weapon and raises the two-handed skill, but it uses one handed perks. It also does very low damage(about what you would expect from a one handed sword), it cannot be upgraded via smithing, and apparently, it swings faster than other two-handed weapons(about the speed of one-handed swords) which could be seen as an upside. Some people think that it was meant to be a one-handed weapon, but was accidentally changed to a two-handed weapon and others think that it's a two handed weapon with a lot of bugs. I personally that it is indeed a two-handed sword, due to the fact that there is a lack of "special" two-handed swords in game.