Fact is that they would probably hate the Old Ones/Slann as well as Daemons, as they reshaped the world. And I doubt the bigger gribblies would be able to land themselves, making them "fly" is a little far fetched - a Manta Ray can't fly :-p
Maybe give them Sea Dragons (many dragons fled Chaos to the bottom of teh seas) that can't fly, and give them massive spear launchers etc crewed by Nauticans.
Giant Crabs and the like, Sea Snake swarms would be nice, and maybe all weapons can be upgraded with stonefish poison?
Finally, if they predate magic, I doubt they would have their own magic to the extent you have them. To compensate, maybe their disbelief in magic is so strong they have a great resistance to real magic?
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