Conductive is a general property that can be applied to  [[Electric]], [[Fire]], and [[Cold]] damage types.

When a material with this property makes contact with something that deals [[Electric]] damage all creatures touching the material receives the [[Electric]] damage.

This comes in to play most often with armor. Typically you only take damage if the base damage of an attack gets through the armor. But if the armor is Conductive and the attack deals electric damage you will take that electric damage if the attack hits. If the base damage gets through the armor you take the electric damage twice. Once for the conductive property and once from the damage getting through the armor.