Sidjera was a male weasel and first mate aboard the Rustkeel, Captain Flager's original ship. He survived throughout the Wellt days and accidentally disclosed the location of Flager's fleet to an unscrupulous tribal rat soldier. On the night of their escape from the Isle of Wellt, Flager was notified about Sidjera by Slicky the rat and had Sidjera slain for his mistake.