Zelgerath’s current goal is to complete the Greater Mario Series, meaning basically any games in which Mario or his friends appear.
The Greater Mario Series is like a Hydra with many heads. It feels as if each time I cut off a head, a new one grows back. However, the heads can be defeated faster than new ones can grow. It’s just that Mario has been consistently popular for many years, so therefore many heads have grown in that time. Some have been waiting to fight me since before I was born.