Multinius Gobtrax was an antagonist in The Edge Chronicles before the series took place. He was an evil sky pirate on whose ship Twig, son of Quintinius, was born. Multinius immediately ordered Quintinius to abandon the hour-old Twig and leave him to his death. 

Multinius was said to be an evil, cruel, despicable and ruthless captain, whose very name made his crew shudder. He is only mentioned during Twig's birth and is the reason for his wanderings in the Deepwoods.

Multinius presumably made it into Undertown and selfishly made off with any cargo he had.