Helpless
You are bound, sleeping, unconscious, or otherwise completely at an opponent’s mercy. You are treated as having a Dexterity of 0 (making your Dexterity modifier -5), and melee attacks against you gain an additional +4 bonus (equivalent to attacking a prone target). Ranged attacks get no special bonus against you.
Source
Core Rulebook pg. 276
Dragonscript
Effect
bonus (character.dexterity * -1) to character.dexterity as misc;
