When the Overlord exhausts the Call of the Ravens card, he places the Raven Flock token in a space adjacent to a monster. The unfortunate monster suffers 4 File:Heart.png in the process. The Raven Flock can be upgraded by the other cards in the Unkindness class, but these cards have to be drawn from the Overlord deck normally, and goes into the discard pile after the Raven Flock has been destroyed. If the Raven Flock token is already on the map when Call of the Raven is invoked, it is moved from it's current location to the new place where Overlord has summoned it.