Allagan bio-engineered races? Well we're absolutely certain the Ixal are degraded versions of Iksalion encountered in the Fractal Continuum; one of the Ehcatl Nine even has new dialogue after Azys Lla (Ayatlan). There's also strong hints that the Gigas of Mor Dhona and the Vanu are also Allagan creations - the Gigas worship the Crystal Tower, and the Vanu considered protecting the key to Azys Lla a sacred task, suggesting the Allagans made them as guardians of the Tower and Azys Lla, respectively. We also know they somehow synthesized Voidsent, but just how you can make an artificial demon is beyond me...