Immunity

Immunity simply means that a class is unaffected by a certain type of action.

Permanent

 * The Mastermind is immune to death at night.
 * The Possessor is immune to death at night.
 * The Scorned is immune to death at night.

Temporary

 * The Alchemist can prevent someone's death via the use of its  Crimson Potion ability.
 * The Alchemist can grant herself immunity through use of the Stoneskin Potion ability.
 * The Hunter can grant himself immunity through the use of its Spike Traps ability.
 * The King can prevent the death of itself or another player through its  Guard ability.
 * The Knight can sacrifice itself to prevent the death of another player using the  Sacrifice ability.
 * The Mercenary can grant herself immunity through use of her Stand Guard ability.
 * The Physician can prevent someone's death via the  Heal ability.
 * The Priest can make a player immune to death for one night using their Bind Soul ability.
 * The Soulcatcher can make a player immune to death for one night via Bind Soul.
 * The Reaper can make themselves "come back to life" effectively giving them death immunity, if they are attacked and have a soul to do so.

Permanent

 * The Butler is immune to occupation.
 * The Fool is immune to occupation.
 * The Hunter is immune to occupation.
 * The Paladin is immune to occupation.
 * The Poacher is immune to occupation.
 * The Possessor is immune to occupation.
 * The Prince is immune to occupation.
 * The King is immune to occupation.
 * The Scorned is immune to occupation.
 * The Servant is immune to occupation.
 * Additionally, if you were to be occupied 3 times, you will become immune to occupation.

Temporary

 * The Enforcer can give The Assassin immunity to Occupation using Frenzy.
 * The Ritualist can make the entire Cult immune to Occupation using Brotherhood.

Permanent

 * The Alchemist is immune to Conversion.
 * All Unseen classes are immune to Conversion.
 * All Cult classes are immune to Conversion.
 * The Fool is immune to Conversion.
 * The King is immune to Conversion regardless of Faction.
 * The Possessor is immune to Conversion.
 * The Prince is immune to Conversion.
 * The Reaper is immune to Conversion.
 * The Scorned is immune to Conversion.

Temporary

 * The Drunk can make themselves and another player immune to Conversion through the use of its Happy Hour ability.
 * The Paladin can make a player immune to Cult Conversion, by killing the Cult Leader if they visit them.
 * The Hunter can grant himself immunity through the use of their Spike Traps ability.

Permanent

 * The Herbalist is immune to Nightshade poison.
 * The Physician is immune to Nightshade poison.

Temporary

 * The Court Wizard makes a player immune to all negative effects at night besides Death and Conversion.
 * The Court Wizard makes a player immune to all visits through the use of Ice Ward.
 * The Sage can make their target immune to all visits (bar The Assassin) via Wall Of Fire.
 * For the first 3 nights, The Mastermind is immune to The Sheriff's ability to determine them as Unseen.
 * The Mercenary can make their target immune to all visits by using Stand Guard.
 * The Sellsword can make their target immune to all visits by using Stonewall.