"The fourth episode of 'Helck' begins with Helck, Vermilio, and their crew traveling through the poison-infested lands of the Demon Empire, aiming to reach Urum Castle. Along the way, they encounter numerous monsters and defeat them. Eventually, they arrive at the castle, where they engage in battle with the winged knights.

During the fight, a winged knight named Edil recognizes Helck due to their past encounters. Edil, who has retained his personality despite his transformation into a winged knight, explains that he and his comrades have undergone a process of 'awakening,' granting them immense power. He claims that this power will continue to grow with each battle, enabling them to effectively combat the demons.

The winged knights' plan is to advance deeper into the Demon Empire and fight the Demon Scourge head-on. However, the crew is aware that the sheer number of troops could pose a significant threat if all humans awaken to this power. Despite their enhanced abilities, the group believes they can handle the winged knights, as they are still weaker than the heroes of the past.

During the battle, a crew member named Hyura from the Ahald tribe, known for his regenerative abilities, manages to defeat one of the winged knights. However, the situation escalates when a gate created by a spatial-teleportation spell appears, threatening to swallow the entire castle. Vermilio decides to destroy the barrier stone powering the gate to close it, but in the process, she is sucked into the gate. Helck leaps in to save her, and both vanish as the gate closes.

The episode ends on a cliffhanger: Vermilio wakes up in an unknown location, surrounded by the scent of Helck's cloak. The crew is left behind in the Demon Empire, uncertain of what has happened to Vermilio and Helck and what their disappearance means for their mission."