In Ars Magica Evil is very real. Manifested in the Infernal Aura and all its aspects. However, Medieval thought recognized that the concept of evil was not clear cut, and spent a great deal of time pondering it. Below are some attempts to examine the issue:
Secretum secretorum index - De Mirabilibus Mundi index
Atlas Games - publishers of Ars Magica Redcap - Ars Magica portal
Last modified: Sun Dec 27, 1998 / Jeremiah Genest