By the time of the Great Galactic War, the planets Belkadan and Sernpidal had governments which were secretly controlled by a secret Sith Empire. These governments turned on the Republic fleet in the Tingel Arm at the beginning of the war.
Following the conclusion of The New Jedi Order novel series, the Dalonbian Sector - and its resident systems - is not referenced in any way. Its role, if any, in subsequent canon is unknown.
The Essential Atlas's appendix incorrectly places Artorias to the L-2 coordinates. The maps of the Yuuzhan Vong War place the world elsewhere to K-3 grid coordinates. The first version of the Essential Atlas Online Companion still used the wrong coordinates placing Artorias to the Dalonbian, but the later .pdf version corrected this and placed the planet to the Myto sector.