Phogoth barely moves and he stays in the DoT if you corner him correctly. I never claimed this weapon is effective against the Archon Priest or Omnigul. They move like crazy and Ghorn is way better there. Valas only moves left to right by a step or two, and if you dps right at the start, you can kill him before he walks towards you. This weapon is very effective there. The nexus doesn't move enough to get out of the DoT. The devil walker doesn't move at all. But sepikis moves a little. The only reason I use this on Sepikis, is because I usually have a few rockets left over from the devil walker encounter and dont want to lose them to switching weapons. Ir Yut is slaughtered by this weapon. It literally makes that encounter a joke. It also parts thrall out of the hallway like Jesus parting the Red Sea.