In the context of medieval Germanic literature, particularly the "Dietrich von Bern" saga, Dietrich is often depicted as a heroic figure who battles against a variety of fantastical beings. Here are some of the common adversaries he faces:

1. Giants: Dietrich frequently encounters giants, who are often portrayed as formidable foes with immense strength. These giants can represent chaos and the untamed forces of nature.

2. Dragons: Like many heroes in epic literature, Dietrich battles dragons, which symbolize greed, destruction, and the challenges that heroes must overcome to achieve greatness.

3. Monsters: Various mythical creatures, including ogres and other monstrous beings, are common adversaries. These creatures often embody the fears and challenges of the time.

4. Witches and Sorcerers: In some tales, Dietrich faces magical beings who use their powers to challenge him, representing the conflict between good and evil.

5. Other Heroes: Occasionally, Dietrich finds himself in conflict with rival heroes or warriors, which can lead to epic battles that test his strength and honor.

These battles serve not only as physical confrontations but also as allegories for the struggles between civilization and chaos, order and disorder, and the hero's journey toward personal and communal redemption. If you have a specific poem or text in mind, I can provide more detailed information about the beings Dietrich battles in that context.