It's one of the two most famous martial styles in the Empire, the other being the Arseid school.
There are two styles of the Vander school. The primary style uses a greatsword, focusing on large, powerful attacks to crush enemies. Due to the strength required to use a greatsword, this style is used by those with sufficient bulk. A lesser known, dual-wield style is also practiced, focusing on rapid strikes to overwhelm enemies. This style is used by those with less strength, such as people with slim builds.