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The Mother Grub is a monstrous being who lives underground on the planet Alternia. She gives birth to all Trolls from a mixture of the genetic material of all adult trolls, delivered to her by Imperial Drones from filial pails. She combines all the genetic material into one diabolical incestuous slurry and lays hundreds of thousands of eggs at once.
If a troll has Jade green blood, they warrant the protect of a Virgin Mother Grub. This is a Mother Grub that relinquishes her duty to look after a young troll, never laying any eggs.
When a Mother Grub dies, a Matriorb can be retrieved from the deceased Grub. It can be used to hatch a new Mother Grub.