Also judging from what I already know about the Cabal I think they might be the biggest problem out of the four races seeing as how even the lowest ranking of the Cabal is still heavily armored. They honestly sound like the might be the most challenging of the four races to kill. A small group of four of the lowest ranked Cabal sound like they could be almost as big of a challenge and time consuming to kill as a Devil Walker while maybe six or seven be as time consuming as Sepike Prime which by the way people complained in several forums about Sepike Prime being "OP." Honestly if you think Sepike Prime is OP then you must be a giant noob as he is a super easy boss especially after the boss before him. All Sepike Prime can do is teleport, shoot medium explosive energy shots (four or five in a consecutive row) and if you get close he drains your life (If you want OP bosses by the way then play Dark Souls). The only challenging part about Sepike Prime is you also have to worry about Fallen. Now the Devil Walkers are a little OP but not a major problem if you now a helpful weakness I figured out in the beta level 6 earth raid. Take out the missile turret attached to the tank turret then you can just run around him as long as you aren't directly in front of it (there's a chaingun on the very front that will get you up close) and just jump around as you shoot it's legs so you can avoid the grenades and the EMP only takes out your shields and by the time it uses another EMP your shields are already fully charged. In the level 6 earth raid be sure to take out the fallen first before getting close your you will die and when the fallen re spawn just fall back, kill them, then get close again, simple as that