What does preference dx9 legacy mode mean

lol preference dx9 legacy mode, this is the legacy mode, it is set up to prevent those old players from not getting used to the new system.

dx9 legacy mode is a version of the multimedia programming interface, an application program interface. It allows platform games or multimedia programs to achieve higher execution efficiency, enhanced graphics and sound effects. It also provides designers with a ****same hardware driver standard.

In the Land of Runes, magic is everything.

The continent of Valoran is where magic is more than just a mysterious and unfathomable concept of energy. It is materialized matter that can be channeled, shaped, molded, and manipulated. Magic in the Land of Runes possesses its own natural laws. The results of the random variations of Source Ecology magic alter the laws of science.

There are several continents in the Land of Runes, though all life is centered on the largest magical continent, Valoran. The continent of Valoran resides in the center of the Land of Runes and is the largest continent in the Land of Runes by area.