After the alien beasts divided the world into various safe alliances, communication among different alliances became difficult, and each alliance developed its own countermeasures based on regional features in response to the pressure of different grades of immortal alien beast powers.
The mainstream Beast Taming technology of the Free Safe Alliance, which is based on clone technology and transgenic technology as its underlying theories, has evolved into bioengineered beasts over several decades.
This technology can mass-produce entirely new species of alien beasts that don't originally exist, to some extent circumventing the restrictions imposed by the Alien Beast Ban, but it doesn't enhance the Beast Tamers themselves.
The Guardian Beast Co-operation combat of the Free Alliance was established over a decade ago by a Yan Huang Alliance exchange team led by Researcher Qin Yunzhang, who secretly visited other safe alliances for technological exchanges.