Auto-translated
and in the original Heroes 5, the plot is as follows: give a link or write it briefly.
In short, King Gryphon is killed by Argail, Argail himself is in love with Isabelle and betrays the Overlord. Then Tieru, an Elf, appears to him and tells him about the dark messiah. Argail is cleansed of demonic magic. The Necromancer, Markel, helps to resurrect the king and takes power in the Gryphon Empire. Argail becomes a dark elf and changes his name to Railag. King Nicholas, a high vampire (resurrected by Markel), leads the undead army against the elves. Faidaen, an elven hero, defends the elven lands from the undead. Isabelle is kidnapped by the Overlord. Godric, Faidaen, Railag, and Zehir (son of the King of Mages, Cyrus, who was killed by Markel) unite to save Isabelle. They go to the capital of demons, Shio, where they banish the Overlord and take Isabelle, who now carries the dark messiah in her womb. Isabelle becomes an evil character and returns to the empire, where she now begins to rule. Then play Lords of the North!