Geneboosting is done during the fetal development stage. It perfects the genetic structure of the patient, removing all genetic diseases and rendering said patient the perfect form of their genetic heritage, whatever that may be. This form of genetic modification is limited to the upperclass, and is only now becoming common among the Dominian primaries belonging to rich houses. The effects lead to perfect, patrician features of the patient. Geneboosted playable species tend to be a foot or so taller than average and find it very easy to maintain peak fitness. A geneboosted person is obvious at a glance. Interestingly, all Skrell are geneboosted in an effort to combat the genophage however the effects are not as robust as on other species. Skrell do not increase in size or strength but rather use geneboosting as a method to cure the genophage. Sadly this only works in around 33% of cases.
Gene therapy is done post-birth and uses genetically tailored retroviruses. It is more expensive by far than geneboosting and requires the patient to be suspended in a gene therapy tank, from seven days every few months for several months or more depending on the "change". This is commonly done by rich patients to "geneboost" themselves after birth, however some use the treatment to alter traits in themselves - eye color, muscle mass etc. Such treatments are always extremely dangerous and require constant care during the process and are thus extremely expensive. This form of gene therapy is largely irreversible and can lead to instabilities in the genetic structure of the patient which can lead to malignant cancerous growth or - in the worse case - biological instability, with the flesh literally melting from the poor victim. In the former case immediate gene therapy can save the patient, in the latter it's much too late. Characters should use gene therapy to change their traits with great caution. This high risk, very high expense, and high maintenance process is usually found among upper-class citizens in especially strenuous professions.
In the same manner as mechanical augments, biological augments such as tailored eyes, robust muscles fibres and strengthened bones are implanted into the patient. This also covers genetic neutral (zero percent rejection) biological limb replacement. Known tried and tested bio-augments would work every time. Black market augments, though cheaper and or more "powerful" tend to be unstable, leading to rejection at best, necrosis at worse. Though still very expensive, the occasional citizen outside of the aristocracy can be found with these augmentations, with efforts being made to make them more accessible to the greater populace in the future. https://wiki.aurorastation.org/index.php?title=Empire_of_Dominia#Ethnicity_in_the_Empire