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.
An ancient, psuedo-immortal race has been manipulating something important (politics, religion, economics, etc.) for centuries. Hardly anyone is aware of them, let alone their goals.
A tribe of barbarians appear wearing necklaces of bear claws and great cloaks of brown fur. They are physically much larger than normal humans, much stronger, and shrug of the most vicious of wounds. They call themselves the Aklak after their totem spirit.
- From the Inuit word for Grizzly Bear