Mother grub

The Mother Grub is a monstrous being who lives underground on the planet Alternia. It(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.

Only the skull of an ancient mother grub, slain thousands of solar sweeps ago has been seen. However, as the skull bears an uncanny resemblance to GrimAuxiliatrix's Lusus it is possible that her Lusus is in fact a Mother Grub or some derivative thereof.