don't worry about it; i saved you some trouble.
"The dhour attacks physically by lashing at its victim with a powerful pseudopod, delivering 4d4 points of damage with a blow. If it manages to grab a hold of its prey by rolling a natural 19 or 20, it can throw itself over the poor sod and engulf him. The victim gets a saving throw versus paralyzation to pull free, but if he fails he dhour surrounds him. Engulfed victims immediately begin to suffocate (death follows the number of rounds equal to one-third the character's Constitution score), and suffer 2d6+6 points of acid damage each round.
While the dhour engulfs its victim it can lash out at any other nearby creatures with its pseudopods, but can't move. Dhours are immune to Type B weapons and suffer only half damage from Type S weapons due to their amorphous structure. Successful attacks on dhours that've engulfed victims (or are in the process of doing so) cause the same damage to the victims as to the monsters."
Tell me what you think, it's basically the same idea (just replaced the name, fixed a few minor things for 3.5 consistency, and added the part about acid damage and immobility):
Drown (Ex): The first victim hit by a dhour's pseudopods must make an opposed grapple check with the dhour. If the dhour wins the check, it draws the victim into its fluid body. The victim takes 2d6+6 points points of acid damage per round, and is also at risk of drowning (see Water Dangers in the Dungeon Master's Guide for the risks and effects of drowning). Because a dhour is not composed of water, spells such as water breathing offer no help in surviving the effect of drowning in their fluids.
A trapped victim can attack the dhour or make additional grapple checks to escape its grasp. The character cannot cast spells with a verbal component or use any other item or ability that requires speech. If other characters use edged weapons to attack a dhour while it is holding a victim, those attacks have a 25% chance of hitting the trapped character, and they do no harm to the dhour.
While holding a victim, a dhour continues to attack with its pseudopod, dealing slam damage to other characters. A dhour cannot move while holding a victim.