Monster Module p.10
Antimagic Susceptibility. The shield is incapacitated while in the area of an antimagic field. If targeted by dispel magic, the shield must succeed on a Constitution saving throw against the caster's spell save DC or fall unconscious for 1 minute. False Appearance. While the shield remains motionless, it is indistinguishable from a normal shield.
Bash. Melee Weapon Attack: +3 to hit, reach 5ft., one target. Hit: 4 (1d6+1) 1d6+1 bludgeoning damage.
Protect. The shield imposes disadvantage on an attack roll that target a target other than the shield that is within 5 feet of the shield.