Synthesis flowers are known for their large, color-changing flowers and their ability to fuse with and eat humans. A fully matured synthesis flower is approximately 6 feet in diameter, with a large hole in the center that reaches into its root system. It creates a sweet scent and emits pheromones and telepathic messages which convince all kinds of animals to climb into the hole in the center, where it usually digests the creature.
The plant gets its name from its interaction with humans. A synthesis flower with a human victim begins to make itself one with its prey instead of digesting it, hijacking the person's body and central nervous system. Over the course of the next few days, the human host will either lose their will and become one with the flower, which enters the post-synthesis phase, or the flower will find its host unworthy (often because the host is too strong-willed to be fully controlled) and the human will be fully digested.
A synthesis flower with a host has even more telepathic potential, and will often retain much of the supernatural abilities of its host. The host will retain many of its memories, as well as the ability to speak and some semblance of its personality, but its only interest and goal in life will be to attract and consume more victims. It will spend much of its time unconscious, awakened only when a sufficiently large animal is nearby. It can defend itself with its root system, which becomes prehensile and develops more and more strength as it progresses further into the post-synthesis phase. Their telepathy could reach for miles, corrupting the dreams of humans and giving them the idea to come to the forest.
Supposedly, much of the funding for the project that developed the synthesis flower came from the Manta Carlos
Government, to help deal with the plague worm infestation of the twenties. Why the flowers ended up the way that they did remains a mystery to this day. Soon after the flowers were deployed, the mage who developed the flowers and his wife both disappeared, their home burned to nothing with magic fire. Many believe that the couple became one with their creations, or that one of the two became a host to the flower and devoured the other. In any case, the flower was responsible for an alarming series of disappearances that flared up in the late thirties and lasted into the early forties, when it was finally discovered why so many people were dropping their lives and wandering into the forbidden forest, never to return. Most of the population was culled with the newly-invented napalm in 1943. They are rumored to still exist in small numbers in the forest, careful not to attract too much attention, but still a threat to those who wander too close.
The government now requires a lot more oversight for any attempts to deal with invasive species.