New Game: Star Wars: War in the Unknown Regions
After Ahsoka was saved by Ezra and brought to the World Between Worlds and they became separated she made a promise to herself to meet each other once again in the future. With Rebellion victory assured in the hands of Luke Skywalker after the death of the Emperor and the redemption of Darth Vader, Ahsoka returned to Lothal to have Sabine join her in fulfilling that promise.
Deep in the Unknown Regions, a war has been going on for years. It started when the Chimaera dropped out of hyperspace right into Yuuzhan Vong territory. This incursion into their space broke an ancient truce that was brokered and forgotten about by the rest of the Unknown Regions thousands of years ago. The Yuuzhan Vong declared war on all of its ancient foes.
Ezra and Thrawn were forced to work together to survive. They barely made it out of there. The heavily damaged Chimaera barely made it to Chiss Ascendancy territory. Since their escape, they and every other species in the Unknown Regions are embroiled in a war with the Yuuzhan Vong.