During the Eternal Empire conquest of 3636 BBY Adacin and her constant companion Lord Zanisk went into hiding to avoid fighting the Eternal Empire and remained hidden when Empress Darth Acina signed the Zakuul–Imperial treaty. Following the death of Empress Vaylin and formation of the Eternal Alliance in 3630 BBY, Adacin and Zanisk re-emerged as leaders of an Imperial splinter faction. They set up their base inside the former Separatist stronghold on Ord Mantell and began attacking nearby systems that were allied with the Alliance. This eventually prompted the Alliance to retaliate and in defending their base against the assault, both Adacin and Zanisk were killed.
Lord Adacin appears in the massively multiplayer online roleplaying video game Star Wars: The Old Republic: Knights of the Eternal Throne, during the final boss fight of the "Inferno" Uprising.