The Teratogens constitute a class of the Golgari elite on Ravnica; the other classes being the Devkarin and the humans. Up until the Decamillennial, the teratogens were the ruling class. Afterwards, however, the Devkarin took over.
- In the sciences, specifically developmental biology, a "teratogen" is an agent that can cause malformations of an embryo or fetus. This can be a chemical substance, a virus, or ionizing radiation.