Some comparisons
Necron might actually answer a question that has been rattling around in my head about Anima which was why a primal born of Garlean hopes, and patriotism did not manifest in a traditional Garlean form. Anima, and Necron were both summoned via mechanical means, but Necron had the added Concept layer. Anima may have been so grotesque because it had no guiding concept to shape it unlike Necron. Even more 'traditional' primals were shaped by the mind's eye of their devoted. I wonder if we'll find Necron's conceptual blueprints in what's leftover from preservation or if Calyx took them with him when he escaped.
On the topic of Anima, I wonder if these lines will have some relevance.
"Of paramount concern, even, assuming he didn't name the tower "Babil" on a whim.
In Amon's time, it meant "gateway of the gods." Xande used it to refer to a voidgate, but in this case, it almost certainly alludes to something altogether greater...
...The eldest and most powerful of primals."
I wonder if there is something more to 'abomination' primals like Anima.