The shield may faintly radiate Enchantment magic, if detect magic is cast on it. The shield has no command words, and all of its powers are passive -- that is, the shield activates its powers on its own.
The shield suddenly becomes +2 in all ways when the wielder of the shield comes under the scrutiny of a dragon, or any wyrm-related species. The shield becomes lighter by several pounds, as well, when this happens. No wyrm can harm the shield in any way, including the wyrm's breath weapon attack. Within a ten foot (10') radius of the shield, wyrm senses return a 'false negative'. A wyrm simply cannot detect the presence of anything within that twenty foot (20') diameter of the shield; instead of perceiving a void, however, the wyrm's subconscious fills in the shere with background clutter. If the shield (and its bearer) were standing in front of a tree, the wyrm might see a bush, or might see nothing at all. This 'false negative' affects all the senses of a wyrm, from smell to taste, to hearing. Not even a dragon's true-sight ability can detect the shield. Note that these abilities only function 73% of the time. On a percentile dice roll of 27 or under, the wyrm's 'false negative' fails, and the wyrm perceives a void of blackness -- perhaps believing that the sphere is a sphere of anhilation.
The shield's anti-wyrm capabilities are negated when the shield is within 20" of a sphere of anhilation.
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