What is the fine-grained topic of the following text: When this tyrannical new force learns that the Metabaron is back and headed towards Marmola, the only known source of Epiphyte, the Empire dispatches its most trusted servant: the notoriously invulnerable and cruel Wilhelm-100, The Techno-Admiral. Only return the topic.
The Metabaron's confrontation with Techno-Admiral Wilhelm-100 over Epiphyte control.