Immunity

Immunity is an inherent resilience or total imperviousness to supernatural powers, objects, affects, or forces. Immunities varies between different species as well as within species. It appears that a creature's age, power level, and/or rank within its species hierarchy dictates if it is immune to its species weaknesses and to what degree it is immune.

Characters with Immunity

 * Demons - Demons are immune to silver. They have limited immunity to holy fire, which hurts greatly but does not kill them.
 * Abaddon - Abaddon is completely immune to exorcisms and Churches. She has limited immunity to the Demon-killing knife. She is more resistant to holy fire than other demons.
 * Alastair - Alastair was completely immune to Churches, smiting, and iron. He had limited immunity to the Demon-killing knife. He was initially completely immune to Sam's powers, but later lost this immunity.
 * Astaroth - Astaroth was immune to iron.
 * Azazel - Azazel was immune to Holy Water and Churches.
 * Crowley - Crowley is immune to Churches.
 * Lilith - Lilith was immune to Churches. She was also said to be immune to Holy Water. She was initially completely immune to Sam's powers, but later lost this immunity.
 * Meg - Meg was immune to Churches.
 * Ruby - Ruby was immune to Churches.
 * Special Children - Special Children have limited immunity to each other's powers.
 * Sam Winchester - Sam is completely immune to the Croatoan Virus and demons' White Light. He is initially susceptible to Lilith's powers, but quickly develops complete immunity to them. When he has drank enough Demon Blood, he is completely immune to the powers of other demons.