Sousou no Frieren ep 12 adapted chapters 25 + 26. Not much was explicitly added, but the way this show continues to bring these chapters to life is so beautiful.
In the first part of the episode we basically got a great insight to the guy Himmel is. Does the sword make the hero or does the hero make the sword? He couldn't pull the sword, but he said so what I'll beat the demon lord and prove himself that way. Which is what he did.
Stark is my favorite character in this series. He really is a pure kid, but his upbringing was not the most conventional one. He was deemed the failure between him and his older brother. He ran away when his home was under attack. At the end of the episode it would hit him how both Eisen and his older brother made Hamburg steaks for his birthday. While he never received gifts in a traditional sense both his brother and Eisen really cared for him even if Stark was too young to realize this.
Also I love Eisen's quote. Everyone who works hard is a warrior. A warrior isn't just tied to someone who is strong with might. A sign of a true warrior is someone who works and get the job done as simple as that.