Your darkness spells are harder to suppress.
Prerequisite: Able to cast at least one spell with the darkness descriptor, caster level 5th
Benefit: Magical light sources cannot increase the light level within the area of spells you cast with the darkness descriptor (such as deeper darkness) unless the light spell is at least two spell levels higher than your darkness spell. Spells with the light descriptor cannot be used to counter or dispel your darkness spells unless they are at least one spell level higher than your darkness spells.
Normal: Most spells that lower lighting conditions (such as darkness) can have the area brightened by a light spell at least one level higher than the darkness spell. Most spells with the light descriptor can be used to counter and dispel a darkness spell of the same spell level or lower.
Path of Shadows, © 2015, Ascension Games, LLC; Author Christopher Moore