Nokrum — Alexandra Edgeworth

Fear the knocking of the Nokrum. Elera, an aspiring artist, visits her parents at the Nurekash science museum when the Zeniths ambush their planet. After all power is dismantled, the Zeniths send in their first wave of monsters, trained to instill fear and mass hysteria, and the museum goes into lockdown. Among the monsters is a new, recently conquered race, the Nokrum, and they strike with deadly accuracy. Allegedly ectoplasmic beings, the Nokrum feed incessantly on living matter in order to maintain their titanic sizes. When a Nokrum is jettisoned into the museum, Elera discovers the truth and seeks a way to befriend it without digestive consequences.