Phogoth moves. Archon priest moves. Omnigul moves. Rockets Mcdickface moves. Atheon moves. The Nexus mind dude moves. Which bosses are you referring to?

And I also never said it was good to use for Atheon. He moves like a mofo. The gatekeeper encounter it is great for. The confluxes as well.

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.

That's strange, because whenever I throw a solar grenade at any of the bosses mentioned, they walk away from it. Valus wanders the entire arena, as does Sepikis, the Templar, Sekrion, Atheon, Phogoth, etc. That's why a few of them were able to be cheesed until the baby bumpers were added. These are things the entire community knows about. It's something in the AI. Enemies that are stuck in DoT will path out and away from it. Those that are outside of it won't path into it. There are countless videos that prove what I'm saying. I'd love to see yours.