Energy Drained

The creature gains 1 or more negative levels. Each negative level gives a creature a -2 penalty on attack rolls, saves, skill checks, ability checks. Also inflicts a -1 penalty to effective level (effects things like spells and abilities which rely on caster level or character level). Negative levels stack.

If the target has as many negative levels as its Hit Die or levels, it dies.

Energy Drained happens when Enervation or Energy Drain is cast on something living, or when a Wight, Wraith, or Spectre hits you.

The spells Restoration and Restoration, Mass restore 1 negative level, as does using a Rest Shrine or waiting 1 minute in a tavern. The spell Greater Restoration restores 4 negative levels.

Negative levels regenerate at a rate of 1 level every 2 minutes.