User blog comment:KaiserLos24/Mystery of the Shadow Isles (Summary)/@comment-3974211-20141104003032

Callisto was transformed into a beast as punishment for breaking her bow and we know there's a shapeshifter in production. So... what if Kalista is a shapeshifter? Now we've been told Kalista has a leash mechanic... what if her transformation occurs whenever she is not bound to an ally? It's difficult to really capture "betrayal" as an in-game mechanic, but "abandonment" can easily be achieved - i.e. whenever Kalista breaks the "soul-tether" with her ally.

I hope that forming the tether is a passive effect (because all champions with an active-transformation have been notoriously difficult to balance, due to lacking an ultimate) - or at least some sort of "activatable innate" (like Zyra, or Azir, etc). "Kalista can with an allied champion to form a spirit bond. This has a cooldown. If this bond is broken, Kalista will undergo a transformation - granting her an alternate kit. This transformation lasts based on some condition, most likely time."