The Grey Seer can cast the spell against a single enemy unit. The Skaven player rolls 2D6 for each model in the unit; the opposing player rolls D6 and adds the victim's Toughness. If the Skaven player scores highest the victim is transformed into a Skaven under the control of the Skaven player.

Grey Seers only

In this case a character with the unit must make his test along with everyone else, and is turned into a Skaven if he fails. Players must replace models with Clanrat Warriors with basic equipment - any weaponry, magic items or other equipment carried by the original models are ignored.