Charisma measures a character’s personality, personal magnetism, ability to lead, and appearance. It is the most important ability for paladins, sorcerers, and bards. It is also important for clerics, since it affects their ability to channel energy. For undead creatures, Charisma is a measure of their unnatural “lifeforce.” Every creature has a Charisma score.
A character with a Charisma score of 0 becomes catatonic and unresponsive as it loses its sense of self and falls Unconscious.