Sadly, Siammas are not common these days, just like all the Eriamat race; a lot of people think they're from faerie tales, while scholars and sages believe Eriamats and Siammas still exist, hiding from the other races.
Siamma eggs are unique, since they highly react to any living creature and its emotions surrounding it. A Siamma starts it's gestation process at the moment it can feel life close to it. If this kind of egg is alone, the Eriamat won't grow inside, and it will completely stop its formation, without dying.
At the moment the development of the creature starts, the winding key at the top of the egg will start spinning at its own pace, since this is different for every Siamma. After a solid time of thirty exact days, the baby Eriamat can break the shell of the Siamma, or it can take its time to born.
Siammas can contain just one Eriamat inside, showing every aspect and stage of its development. There are rare cases of two Eriamat inside the same Siamma, sharing the same shape, or sometimes being completely different from each other.
The Eriamat's future behaviour and personality can be heavily influenced by the behavior of the living beings surrounding it.
In the extremely rare case the Eriamat dies inside its egg, a completely new energy is created inside, called Makusian. This energy is believed to be so powerful and mystic, that a lot of bounty hunters are after it, thus making the existence of Siammas even more dangerous for its own race.