"Covers the ground with oil that burns around you."
Location
In the Prisoners' Quarters, there is a chance for a lore room to spawn with a Prie Dieu. Examining this altar will drop this item. Picking the skill up will instantly unlock it.
"A weird altar."
"Look at these strange little men holding it!"
Synergies
This skill can reliably trigger the effects of items and mutations like Spite Sword or Vengeance, without having to absorb heavier hits from enemies.
If Face Flask has the "Generate a shield when used" affix, however, it becomes useless since it can't damage the player.
Notes
The damage from this skill does not trigger death by curse or reset flawless killstreak, but can still kill the user through damage alone.