According to the search results, Grand Admiral Thrawn is loading mysterious crates onto his Star Destroyer in Ahsoka episode 6. While it has not yet been confirmed what exactly these crates contain, there are some strong hints provided by the show. The crates are being retrieved from the catacombs, meaning theyre probably bodies. It is likely that Thrawns new cargo is a legion of corpses, although its not confirmed. The final shots of the episode show Thrawn and the Nightsisters looking out over their haul with triumph, and there are about 1000 of these casket-shaped boxes stacked up, suggesting that they are critically important to Thrawns mission. The Nightsisters on Peridea may have made a deal with Thrawn, where they will summon help from across the galaxy so long as he agrees to transport the caskets of their brethren on his ship. The final destination of the crates is not yet known, but the red-tinged planet that Thrawns Star Destroyer arrives at is likely the Nightsister homeworld of Dathomir. Therefore, it is unclear what exactly Thrawn is transporting, but it is strongly suggested that it is a large number of casket-shaped boxes containing corpses.