This is the conclusion to the Prophecies of Redemption Campaign. The characters have sojourned through mountains and lowlands to reach the forest in which the entrance to the demon lord’s citadel can be found.
But the Citadel is not what one could expect. Can the PCs find their way in and survive to tell the tale?
If a creature is transformed into another creature (say, a human into a dog), then that creature will become more and more accustomed to the new form until a point is reached where reversing the spell is impossible. A second transformation is possible, but the creature will have to go through the whole process again.