First of all the Thief's Guild questline is so freaking amazing even better than the main story. Well i recently recieved the Nightingale armor and some Nightingale weapons (by the way looks amazing), i need Ebony ingots to upgrade my Nightingale weapons but i haven't come across any Blacksmith that sells them, any idea where i can get them?

Thanks

Go on the road between Riften and Windhelm there is a place called shor's stone go to the smelter collect the three ebony ores there. Then go into the mine and clear out the spiders and then look for the deposits(remember one click once and wait for the animation or you need to leave and come back to get the vein). Then go to the smelter and make some ebony ingots. That is the only place I know with ebony ore{there are only 6 locations).