Madame Ruby is a level 60 enchanting vendor located in the Lower City of the neutral Shattrath City. In addition to the standard enchanting supplies, she also sells the limited-quantity enchanting formula for [Enchant Shield - Major Stamina] and a formula for turning three [Small Prismatic Shard]s into one [Large Prismatic Shard]. In addition, she also sells the formula for a Runed Eternium Rod, the enchanting rod for most 375-425 enchants. See List of Shattrath City NPCs.