Welters is a sport played by magical schools. The game is played on a large playing field divided into squares like a chessboard but with the field slightly longer than it is wide. The squares are made of different materials like water, stone, sand, grass, and a silvery metal. The game is played by two teams (usually composed of five players) who start on both ends with the aim of capturing as many squares as possible with magic.If the spell is not performed it could all go to hell , which is said by Margo. The squares represent a different location , along with a different set of circumstances, so you can't just cast it any where you want , it must be on that square
Welters in Brakebills
The best Welters team in Brakebills is the Physicals team who managed to beat the Natural team. The Physicals also represented Brakebills in the international Welters tournament but were defeated in all their games.