what is thrawns cargo

According to the search results, Grand Admiral Thrawn has been seen loading mysterious cargo onto his ship in recent episodes of Ahsoka. The cargo is contained in coffin-like boxes, and it has been revealed that the boxes contain dead Nightsisters. The Nightsisters are a group of Force-sensitive witches from the planet Dathomir. Thrawn has apparently struck a deal with the Great Mothers, a trio of Nightsisters, to obtain this cargo. It is speculated that Thrawns plan involves using dark magic to resurrect the Nightsisters and create an undead army under his command. The cargo is being transported on Thrawns Star Destroyer named The Chimaera.