Seems mobs dont cast/proc many spells yet.
Vox will try to heal herself, but never once do you get hit with the proc. Only answer I could think of off my head was patience
If you want a long fight, go solo Zlandicar with a rusty sword... lol. I did. :p
You can directly edit the mobs in the database, and raise/lower hitpoints.. possibly even change their attack mode? As for adding their proc's in, I've never tried.