The slaad are Outsiders that resemble giant humanoid toads of various colors. Slaadi are native to the Outer Plane of Limbo. As such they are of the outsider type, being composed of the essence of their home plane. The slaadi have been depicted as having a complex social system bound up in the relationship and reproductive cycles of the various subtypes. Some subtypes dominate others, though as slaadi are creatures of chaos, such domination occurs not through a regimented hierarchy, but by brute force. The slaad have been dominated by the Slaad Lords, Ssendam and Ygorl.
If the white slaad survives a century, it turns into a black slaad in the manner of its preceding transformations. The black slaad is the most powerful slaad, excluding the slaad lords. The black slaad is a large slaad but is black and misty in color.