Targetting Helm

Looking like little more than a half helm, each of these magic items has a sigil engraved on its inner surface. If this sigil is carved, in exactness, on a heavy weapon, and Enchant an Item is cast on it, its magic will take effect. If the wearer of the helm is the targeter of the crew manning the weapon with the sigil, any target that the weapon could hit, if fired at that moment, appears to the wearer to be bathed in Fearie Fire. Although this does not guarantee a hit, it does give a bonus of two to the THAC0.

The helm will continue as long as the sigil is not damaged. If the sigil is carved in more than one weapon, along with the Enchant an Item spell, only the most recent one will work. For example, if the sigil is carved on a ballista, then later on a catapult, it would only work on the catapult. To be used on the ballista again, the sigil must be carved a second time.