Nets are weapons. They are often used by water-based races, and are often set with weights, hooks, and/or barbs.

There is no single ruleset for refereeing nets; there are several options provided by various monster entries and modules. Demon Idol uses the rules from WG4 (written by Gygax) as inspiration, and adapts them to better suit general-purpose net weapons.

• If the attack hits, the target is netted. The target must roll a save vs breath;¹⁾ if they fail, they are also trapped.
• Netted creatures lose any DEX bonus to AC (or take a -1 penalty if they have no DEX bonus), are at 50% MV, and cannot charge.
• Trapped creatures are unable able to move, use weapons, or cast spells.
• Both effects last for 1-4 rounds.
  • This duration is halved (round up) if the trapped creature has a bladed weapon handy of dagger length or shorter.
  • A creature can spend a round making an open doors roll. On a success, the duration is reduced by one round. This can be done multiple times.

Characters attempting to use an underwater net suffer a -4 to hit unless they've both (1) taken the net as a weapon proficiency, and (2) trained in its use while underwater.²⁾ Above-water nets suffer the regular untrained penalty for lacking the weapon proficiency.