The blood of steel dragons runs through certain noble houses of Waterdeep. Below are the adjustments to the half-dragon template presented in the Monster Manual for half-steel dragons.
A half-steel dragon is the product of a union between a steel dragon and another creature. Because steel dragons prefer human form over draconic form, half-steel dragons are by far the most common kind of half-dragons in Faerûn. A typical half-steel dragon has dark gray hair, light gray scaled skin, and eyes of two different colors (one dark gray and one silver).
Half-dragons are fully detailed on page 146 in the Monster Manual. The adjustments for half-steel dragons are as follows.
Special Attacks: A half-steel dragon can breathe a 30-foot cone of corrosive (acid) gas.
Special Qualities: A half-steel dragon has a +10 racial bonus on all Fortitude saving throws against poison.
In the Realms
Half-steel dragons are most frequently encountered in large cities and metropolises, such as Neverwinter, Silverymoon, Suzail, and Waterdeep. In the City of Splendors, most half-steel dragons are members of the Confluence, a mysterious organization that battles the Unseen in Waterdeep's shadows.