A weapon of this type enables its wielder to determine the location, depth, species, and number of hostile and/or hungry marine predators within 24". 

A trident of warning must be grasped and pointed in order for the person using it to gain such information, and it requires 1 round to so scan a 24" radius hemisphere. 

There are 19-24 charges in a trident of this type, each charge sufficient to last for 2 rounds of scanning. 

The weapon is otherwise a +2 magical arm.

Class Requirement. Cleric (Druid), Fighter (Ranger, Paladin), Thief (Assassin)