Nuln Oil + Hourglass = Mordant Earth. Obtain both in the same run, upgrade Nuln Oil to its maximum state and open a boss-dropped chest. Nuln Oil is a cross-universe weapon, so this recipe appears in both Warhammer 40,000 and Age of Sigmar.
Identify Nuln Oil and the Hourglass Recipe
| Role | Item |
|---|---|
| Base weapon | Nuln Oil |
| Required passive | Hourglass |
| Evolution | Mordant Earth |
Nuln Oil is the weapon. Hourglass is the passive used to prepare its evolution; neither a similarly named paint-pot collectible nor an unrelated passive replaces it.
Unlock Hourglass and Prepare Mordant Earth
In Warhammer 40,000, the listed Hourglass objective is to survive 10 minutes in a single run. Completing that timer makes the item available; it does not equip Hourglass or automatically evolve Nuln Oil.
- Confirm Hourglass is unlocked in the universe you are playing.
- Obtain Nuln Oil and equip Hourglass during the same run.
- Finish the base weapon's upgrades.
- Open a boss-dropped chest and check for Mordant Earth.
Check the weapon's own upgrade state, not your character level. If the passive is only visible in the collection, the current-run pairing is still incomplete.
Use Oiled with Fire Damage
The base Nuln Oil weapon applies Oiled: surviving affected enemies slow down and become more vulnerable to fire damage. That gives oil a useful interaction with attacks that inflict Burning.
Burning also makes affected enemies move faster, so a fire effect is not a reason to stop watching their approach. The combination concerns status effects; it does not change the Nuln Oil + Hourglass evolution requirement.
Mordant Earth's released-game description includes damaging, slowing zones. Do not assume that every property of unevolved Nuln Oil carries over unchanged merely because the evolution looks like oil. See weapon and ally combos for the wider interaction, or the evolution list for another recipe.