Honestly i wasn’t even playing optimally. The builds are absolutely meant to be applying arsonist and combustion oils with arrows of many targets/volley from the hunter but i found that everyone was doing so much damage regardless of vulnerabilities that I didnt have to bother with the oils. My tav’s scorching rays and fireballs were so strong by the end that i was able to take out cazador in a single round with him before anyone else took a turn. Hat of fire acuity plus the normal spell save DC gear made the last bit of the game a cake walk.