Nuln Oil: slow and fire damage

Nuln Oil applies Oiled through damaging ground zones. Oiled enemies slow down and take increased fire damage. Pairing oil with a fire weapon uses that damage interaction; Burning by itself also damages enemies over time but speeds them up.

Apply oil and fire to the same enemies

A fire attack hitting outside the oil-covered group does not use an Oiled target’s vulnerability. Place the damaging zones and the fire attack where the same enemies pass through them.

The official status description confirms the interaction but does not give a universal percentage for oil’s extra fire damage. It also does not establish a combined movement formula when both Oiled and Burning are active. Use the observed target position rather than treating the two status names as a guaranteed permanent slow.

Evolution requirements

Base weapon	Required passive	Result
Nuln Oil, level 8	Hourglass, any level	Mordant Earth
Flamer, level 8	Glue, any level	Heavy Flamer
Shield of Faith, level 8	Bugman’s Tankard, any level	Emperor’s Wrath

Hourglass’s Sustain bonus extends attacks and effects that read duration. Its recipe role is separate: another source of Sustain does not count as holding Hourglass.

Flamer and Shield of Faith provide two different fire-oriented routes. Their passive requirements are different, so reserve the actual companions before filling every passive slot. Passive planning compares shared and separate requirements.

Account for Burning movement

Burning is useful against durable targets because it continues dealing damage. The same enemy also moves faster while burning. If a fast target is already near the squad, applying fire is not an instruction to remain stationary.

Oil’s slowing effect can help manage the approach, but enemy auras can introduce additional movement or protection. The enemy aura guide covers Tyranid Synapse and Ork Waaagh behavior rather than assuming every rush is caused by the fire weapon.

Paint progression after the hotfix

Nuln Oil kills contribute to unlocking Agrax Earthshade. Hotfix 2.1.6 reduced that kill requirement on Steam; the announcement did not publish the new number. Read your platform’s objective counter, especially before copying an older long-run farming recommendation.

This is distinct from collecting the paint for a character. Paint pots explains named collections, while the release page records the platform split and announced changes.