Star Wars: The Eye of Darkness (The High Republic)

He galaxy is divided. Following the shocking destruction of Starlight Beacon, the Nihil have established an impenetrable barrier called the Stormwall around part of the Outer Rim, where Marchion Ro rules and his followers wreak havoc at his every whim.
Jedi trapped behind enemy lines, including Avar Kriss, must fight to help the worlds being pillaged by the Nihil while staying one step ahead of the marauders and their Nameless terrors.