A benevolent platinum dragon, Bahamut is the draconic god of justice. He has battled Tiamat (his evil sister) for centuries, at one point even losing his immortal status for a period of time.

The black dragon is one of the many chromatic ... controlled by the god themself) in another form. Bahamut is the Good deity counterpart to Tiamat. While there's no official statblock for Bahamut ...