Endeavor is a ship previously owned by William Cooper.
In 4323, Captain Cooper took Keolah and her companions across the Mirandarine Ocean to Zarhanna. However, rather than taking them to Habag, Mithim as had been agreed, he instead drugged them with magebane poison and took them to Razelten, Taverak to be sold into slavery.
Cooper stole Keolah's research notes and left to seek out Torn Elkandu along with some of his crew. His ship most likely fell into the hands of the crew that was left behind when he didn't return.