“We can begin combining our DNA with the Migrators immediately, your highness. Given their slow rate of reproduction, Migrators should be genetically altered as soon as possible. Here are the stats and figures.”
”...I'm surprised the Migrators are so genetically compatible with the other Hegemonic races; not being bipedal or terrestrial or anything. I figured we'd hit a wall with interlacing genetic material of organisms too different from us at some point; I suppose that's the “Maktana Magic” for you.”
“There is an ongoing theory that the similarity between species in the galaxy near each other is no coincidence but based on convergent evolution, though the Migrators are still an exception. Anyways; these gene upgrades will alter their biology significantly from the cold-water evolution. Their lifespan will be reduced to about half, about 500 years, but given their previous lifestyle of being asleep for 99% of their lives anyway...”
”This will be an added benefit, and more effective time. I would hate to be asleep for almost my entire life myself; this is well worth it. Them actually being awake for a war fleet will more then make up for it.”

In addition to the general advancement of the Migrator genome, meaning increases to their metabolism and ability to live in more aquatic environments; you also have the ability to add specific mutations to further adapt the species to your liking. After all, no expense will be spared on this project, the Threemind says, but reminds you that these changes will take some time to appear in the Migrator's gene pool and will not be able to be changed in the future, so choose wisely.