Negative Level Adjustment (3.5e Variant Rule)
From D&D Wiki
(Redirected from Negative Level Adjustment (DnD Variant Rule))
Negative Level Adjustments
Since some creatures, such as goblins and kobolds suck so much, they should have a negative LA, say -1 for goblins or kobolds, to make them more likeable as PCs and more challenging as monsters, due to their extra free class levels.