It is on the leveled list for blacksmiths, and other merchants who sell weapons. It should appear at level 36 just like the other ebony weapons.
To craft it you need the ebony smithing perk, and the same materials to craft the regular ebony sword and ebony great sword. It can be upgraded with 1 ebony ingot.
The stats are as followed: One Handed Weight - 7 Damage - 12 Value - 600