Corroded Saronite Edge

Corroded Saronite Edge is crafted with Northrend Blacksmithing (45); previously learned from weaponsmithing trainers as part of the swordsmithing specialty.

The recipe can no longer be learned, since all weaponsmithing trainers were converted to regular blacksmithing trainers in. It was not removed from the recipe lists of blacksmiths who'd already learned it.