Can cascading Blight kill Presence twice?
Can cascading Blight kill Presence twice?
Yes, it can. Each time you add one or more Blight to a given land - including cascades - destroy 1 Presence from every Spirit there. (p. 15)
So if you had a hideously bad cascade that added Blight to 4 different lands, in each of those 4 lands you'd destroy a Presence from each Spirit.
In the very odd case that you decided to double-back a Blight cascade to hit the same land a second time, you'd again destroy 1 Presence from every Spirit there then continue cascading. This is nearly always a terrible idea.