Nightwatch Napalm is an Ogris-exclusive mod that, upon striking an enemy or object, will form small pockets of fire within a sphere around the impact area. The fire will deal 30% of the weapon's modified base damage as Heat damage with 68% chance to proc over 6 seconds.
Given that Nullifier Crewman bubbles will deflect the trajectory of Ogris rockets, it is advisable to aim at the nearest surface of an approaching Nullifier to allow the Napalm to spawn.
Unlike Zenistar, but similar to Torid, Napalm will not damage Nullifier bubbles themselves, but Nullifiers who walk over the flames will become damaged, even inside their bubble.
Will continue to proc heat over the duration to enemies within the napalm, allowing it and further rockets to deal more and more damage to armored enemies due to Heat proc status effect of temporarily reducing current armor. This synergizes well with a Viral built Ogris, as viral procs will increase heat proc damage and further attacks will deal increased damage due to armor reductions.
This mod, along with the other Executioner mods, are the second set mods to feature non-generic enemies on the mod card, the first being Vengeful Revenant.
The mod used to disperse fire across the ground, but was changed into a hovering ball of fire for unknown reasons. Napalm Grenades inherits the augment's original behavior.
The ball of fire used to act as an object for further rockets to explode, impeding direct hit follow-up attacks with rockets and potentially causing the player to kill themselves by accident (when the rockets did self damage).
NIGHTWATCH NAPALM - Ogris Special Mod Warframe Spotlight