Success-based Dynamic Force Level
Changes the force level of the campaign depending on how well or pooly you did on a mission, affecting the strength of the aliens that can appear on missions. Does not affect the number of aliens that can appear on missions, nor the default generation of force level over time.
Force level itself works on a 1 to 20 scale, with 1 representing the absolute minimum force level the game can use to spawn enemies (think basic troopers, officers, and sectoids) whereas 20 is the absolute highest it can go.
By default it’s set up so +2 is added on Flawless, +1 on Excellent, 0 on good, -1 on Fair, and -2 on Poor, and 0 on mission aborts. This can be adjusted at XComSuccessDifficulty.ini located at (whereever you have XCOM 2 installed)steamappsworkshopcontent268500645146227Config
