Eisen is a key supporting character in the anime and manga series Sousou no Frieren (Frieren: Beyond Journey’s End). He is a stoic and powerful dwarf warrior who was a member of the legendary hero party that defeated the Demon King alongside Frieren, Himmel, and Heiter. Known for his incredible strength and unwavering loyalty, Eisen provides wisdom and guidance to Frieren and her new companions, playing a significant mentorship role after the original hero party disbands.