Thunderbolt Fantasy: Seishi Ikken

Movie adaptation of Thunderbolt Fantasy sidestory novels, split into two parts. The first part tells the backstory of the Screaming Phoenix Killer, Shā Wú Shēng and the second part features a Shāng Bù Huàn story set between Thunderbolt Fantasy seasons 1 and 2.
(Source: Anime News Network)