da SRD livelli negativi:
A creature takes the following penalties for each negative level it has gained:
* -1 on all skill checks and ability checks.
* -1 on attack rolls and saving throws.
* -5 hit points.
* -1 effective level (whenever the creature’s level is used in a die roll or calculation, reduce it by one for each negative level).
* If the victim casts spells, she loses access to one spell as if she had cast her highest-level, currently available spell. (If she has more than one spell at her highest level, she chooses which she loses.) In addition, when she next prepares spells or regains spell slots, she gets one less spell slot at her highest spell level.
un pg con un livello negativo subisce tutti i malus sopra citati ma ad esempio un ladro4 non diventa un ladro3; resta un ladro4 ma con le penalità suddette almeno finchè il livello negativo non diventa, eventualmente, permanente