* [[File:Has bones.png]] '''Has bones''' - This creature has a skeleton and can receive fractures normally.
* [[File:No bones.png]] '''No bones''' - This creature does not have a skeleton at all and is therefore completely immune to fractures.
* [[File:Unbreakable Sturdy bones.png]] '''Sturdy bones''' - This creature has an exceptionally hard and durable skeleton.
** If a creature with sturdy bones were to receive a fracture-inducing hit, they only have a 50% chance per hit to actually receive a fracture. Toss a coin or roll a 1d2, then call it: on a correct answer, a fracture is inflicted.