Problematic Prometheans

Hello Halo Fans! I am currently trying to achieve the “Forerunner Destroyer” commendation. The only problem, is that Promethean enemies appear fairly rarely, and out of balanced with the commendations. For example, I have the Crawler Prime commendation mastered, but have snipers at only expert. Same for the Knight classes. So far, the best chapter for Forerunners is “Switchback” Does anyone know of a chapter that is gonna have a better yield toward the commendation?

this thread would probably help.

This will help.

Thanks guys! I just hope this doesn’t take too long.