Mob Ignorance is a kind of negative perk from ChaoticKarma. It has four tiers, which all require different karma levels, and have different IDs. The Mob Ignorance perks make sets of entities either ignore the player, or not be able to hurt the player. The entities ignored can be modified by different mods.
||Skeletons, Zombies, Slime, Cave Spiders, Endermites
||Creepers, Magma Slimes, Blazes
||Ghasts, Giant Zombies, Witches, Endermen, Guardians, Shulkers