One of the most effective ways to channel negative energy is by using a material called bonebrack. Undead using weapons made of this stuff can channel the effects of their touch attacks through the weapon; such that a ghoul can cause paralysis through a bonebrack weapons as if they touched the victim.
The largest sources of negative energy are on Cubes of Negativity, better known as Death Balls.
|Negative Resistant I||5%||those with a DR5 versus negative energy|
|Negative Resistant II||10%||those with a DR10 versus negative energy|
|Negative Resistant III||15%||those with a DR15 versus negative energy|
|Negative Resistant IV||20%||those with a DR20 versus negative energy|
|Negative Resistant V||30%||those with a DR25 versus negative energy, Pyrmidian Ghouls|
|Negative Resistant VI||40%||those with a DR30 versus negative energy|
|Undead Classification||51%||immune to negative energy, all undead creatures|