okay, a while ago i noticed that the Ignis flamethrower will apply it's damage to all the body parts of enemies who are ragdolled.
Well, i just made my Embolist and guess what? it works even better. The Embolist ignores armor whereas the ignis does not, so it makes very quick work of a pile of ancients or heavy grineer around level 35 umodded while in vauban's Vortex.
Vauban synergizes very well with the Embolist and if you have him, consider getting the Embolist for this reason.