My Northern Cross Priestess put Magic Aura on an enemy Shade summoned by Haunt. The Aura did not damage units within 2 spaces of the Shade at the beginning of the enemy's turn. Enemies within two spaces: Crossbone, Shade
Aura damages units at the end of THE UNIT turn. When you grant aura to an enemy, it should deal damage at the end of your enemy's turn, but as the aura is granted only for 2 turns, it dissapears before damaging anything. Short story, grant aura only to your units if you pretend to damage something.