According to the records on the Stele for Suppression of the Dragon, Bi'an is fond of litigation, also known as constitutional law.
Legend has it that Dragon Son Bi'an was eager to serve the public good, eloquent and generous in speech, sharp as a needle in his insight, and clear in discerning right from wrong, fair, and unbiased.
In the years when 'dragon' was not yet a name shrouded in evil, figures of Bi'an were commonly used to decorate the thresholds of prisons and stood dominantly on either side of the hall in official buildings, awe-inspiring and commanding.
Dragon Son Bi'an was one of the first generation of the sixteen direct descendants of the dragon, and in both seniority and strength, he ranked above Chiwen.
The brother that Chiwen spoke of before its death was likely this very Dragon Son Bi'an before us.
Lin Xun was using Chiwen's Shell, intending to disguise himself as a brother of Dragon Son to infiltrate the enemy, but the current situation seems a bit off.