0.15 Note
Due to the removal of alien artifacts, the victory poles only require 5 wood to build now. Also, biter expansion can be simply turned off via the advanced map settings in the base game, so this mod has become slightly obsolete.

Miss the pre-0.13 method of using victory poles to prevent biter expansion? This mod adds a craftable victory pole item to emulate pre-0.13 behavior.

The victory poles require their own research which is under Military 3 in the tech tree. After completing the research, the poles can be crafted for 2 wood and 10 alien artifacts. For reference, biter spawners drop between 2 and 10 artifacts, and spitter spawners drop between 5 and 15 artifacts.

With the default configuration, each victory pole that is built creates 200 invisible entities that trigger the expansion candidate formula. You can see what the effects are in the image above. Feel free to edit the number of invisible entities to suit your taste via the top line of the control.lua file.