The Legend of Heroes: Trails of Cold Steel IV[c] is a 2018 role-playing video game developed by Nihon Falcom.

[3] Two weeks after the events of Trails of Cold Steel III, Chancellor Giliath Osborne has taken control of the Erebonian Empire and intends to start a war with Erebonia's neighboring country, the Calvard Republic.

Meanwhile, Class VII flees to Eryn, a secret village of witches, where they form a plan to rescue Rean Schwarzer, captured by Osborne after losing control of his Spirit Unification power.

During the course of the story, Class VII, while resolving numerous incidents across western Erebonia caused by either political issues, the Great Twilight or Ouroboros's plans, uncovers the mysteries surrounding the Divine Knights, their Awakeners, and the dark history of the Empire.

In the normal ending, Rean absorbs Ishmelga into Valimar but is unable to contain it, so he along with Crow Armbrust, Millium Orion and their Divine Knights sacrifice themselves to destroy it.

After the post-war issues have been resolved, including an end to the Erebonian occupation of Crossbell, Class VII transfer Millium's soul from the sword into a backup body and together with their allies attend the wedding of Prince Olivert and Scherazard Harvey.

Plans for a fourth Trails of Cold Steel game were revealed in an interview with Nihon Falcom president Toshihiro Kondo in November 2017, where he stated that Trails of Cold Steel III was originally intended to conclude the story arc but Falcom found it difficult to satisfactorily wrap up the story without a fourth entry.