Aberrations are utterly alien beings. Many of them have innate magical abilities drawn from the creature's alien mind rather than the mystical forces of the world.
Anatomy & Morphology
Aberrations can take just about any form imaginable.
Genetics and Reproduction
Aberrations to not reproduce sexually, many do not reproduce at all. Slaad reproduce by injecting a tad pool into a living beings body, where it will grow and eventually kill its host.
Growth Rate & Stages
Its impossible to say how all aberrations grow, but many develop while acting as parasites to other beings. Before eventually growing to maturity and killing the host.
Ecology and Habitats
Aberrations tend to reside in many planes of existence, even Limbo. They can live in the most extreme environments.
Dietary Needs and Habits
Some aberrations don't eat, some devour knowledge. With so many being unknown, they could eat just about anything.
Aberrations grow over time, many experiencing extreme physical changes.
Perception and Sensory Capabilities
Aberrations can use the five sense, or powerful psionics, or anything really.