3/2 (Sorry, I underestimated how long this would be.) The "Incestous Slurry" is then given to the Mother Grub, who is somehow fertilized with it. She then lays an egg, or Matriorb. This Matriorb is then cared for deep underground by Jade Bloods in the brooding caverns. Eventually it hatches an entire generation of grubs. These grubs must then find there way out of the brooding caverns on there own, and the ones who survive are chose by Lusii. The Lusii then raises them to be a member of society.

Okay I’m posting part 3 because it’s not nearly as graphic as the other two parts, and because there’s two misconceptions here I’d like to clear up! The Mother Grub doesn’t ‘lay an egg or the Matriorb’, given the Matriorb is what spawns the Mother Grub, and it’s heavily implied there’s only one fertile Mother Grub (At least on Alternia, was it ever stated if there were other Breeder Colonies? I’d imagine a Warmongering Spacefaring race such as the Trolls would need a lot of numbers), it’s likely the Matriorb is only laid at the end of their lifespan, or, as Kanaya did, needs to be extracted after death.

The other misconception is that the Mother Grub doesn’t lay ‘one egg’ from which an entire generation of Grubs hatches.

She lays several thousand of them.

Incidentally, this is also the only time we see the size of the Mother Grub, or at least the rear of the Mother Grub, with one leg lightly visible.

Also the Eggs are shaped like Ant Eggs.