Reflectorum Arcana

Casting this dweomer causes a golden hemisphere to attach to the shield arm of the target individual. The magical shield bestows a +3 AC bonus and reflects magical projectiles, including the following spells: magic missile (including similar spells), Melf's acid arrow, flame arrow, and Melf's minute meteors. In addition, the shield halves the damage of lightning bolts that are hurled at its bearer. The direction of the reflection is rolled randomly (see table).