$$$
Price check on creating the Cherubim; short in stature, look somewhat child-like in comparison to Humans or most other humanoid races, but fantastic inventors/tinkers, good craftspeople, good engineers/architects(particularly good at protective construction. Whether that be fortifications or just tough stuff), great armorsmiths, affinity to Enchantment magic(not sure whether it would cost less to include in creation or add later). Natural affinity for working with and controlling the Sentinels.
Price check on creating what for now I will call the Chiracyx; amphibious semi-crab-like people, rather large, thickly built(as in they look almost spherical and have giant arms), don't look human, have a sort of scal-chitin-carapace covering them nigh perfectly, are almost truly omnivorous; metals and stone and the like goes to improving their armor shell, the quality of which and style of it(since they can change how it grows based on various stuff; this is preliminary, so I'm not detailing everything) partially determines their status. Good isn't something they're super-passionate about, but that's most.y because it's just a given to them; it's simply what you do. What everyone does. It would be ridiculous to do other stuff(mostly; they aren't perfect, obviously). Diet mostly consists of small crustaceans, shellfish, or fish, and plant matter, plus ore and other stuff to improve their shells. Not actually slow or dumb, they just take the time they feel necessary to think through their decisions, and so they appear slow, but it's more like 'deliberate'. Not the greatest manual dexterity or speed, but not actually bad either. Their shells molt occasionally(just bits and pieces; remember, it's also partially based on scales(though that's as much because that let's it cover everything with almost no weak points), and because of their strength, they can't be reconsumed(that's considered disgusting and akin to cannibalism anyway, though it's accepted that if there's no other way to keep your shell from falling apart...). Chiracyxian armor(as in, made from high-quality molted Chiracyx shell) is some of the best in the world, even if somewhat heavy.
Price check on giving Seraphim Cosmic affinity.
Price check on making the Cherubim and Chiracyx at the same time.
Price check in making them both at the same time on opposite worlds, so that they're sorta linked in the reincarnation thing, if souls even get bound to a single race.
Price check on making them and then/additionally propagating all my races to a total of 15 million, in the following proportions: 5 million Seraphim, 4 million Ophanim, 3 million Cherubim, 3 million Chiracyx.
Blargh. There. I did the first part of the massive post thing