Build: https://i.imgur.com/ro9yQZb.png
1. Hit at lest 3 crits to stack up Headbanger, 5 for maximum damage, and activate Volcanic Rounds on last shot to apply Burn
2. Use Feed the Flames and Ash Blast. Make sure Ash reaches Okriel, wait for Despair icon, it’s the last one on the right in the clip
3. Hit a non-crit for the kill
source
Crazy!