A quick sketch of the first concept I came up with. My top three aquatic animals are Octopus, Jellyfish, and Turtles/Tortoises. So, I wanted to do something with at least one of them, but I got an even better idea as I was sketching.
As you can see, I combined the Jellyfish and Turtle into one Magnus. I wanted to go for a Jamaican themed Magnus in which the turtle and jellyfish are born together from an egg made of a special kind of water. As this Magnus grows, so does the bond between the two creatures, and the Jellyfish becomes more and more infused with the turtle. In the next couple stages, I look to fuse them together in such a way that it looks like the turtle has dreads, and of course their look of maturity will increase.
Something else to note is that, in this form, this Magnus travels with bubble jet propulsion from the egg.
Doesn't have a name yet. Not a final design, but let me know what you think of it, please.