Entangle

From NWNWiki

This article is about the effect; for the spell, see Entangle (spell).

Entangled creatures are unable to move and are considered flatfooted. Entangled creatures receive a -2 penalty on all attack rolls and a -2 penalty to their dexterity modifier. An entangled character who attempts to cast a spell or make use of a spell-like ability must make a concentration check (DC 15) or the attempt will fail.

While entangled, a creature's modified dexterity score is overridden to 3 and is unchangeable. The creature's dexterity modifier, however, is not similarly overridden to the corresponding value (-4) unless the base dexterity score gets changed (e.g. from leveling up or from a polymorph) while the entanglement is in effect. (Probably a bug.)