Heavy Shield, Wood

A few historical examples:
 * Greek aspis
 * Greek hoplon
 * Roman scutum
 * Persian spara

Heavy Shield One-Handed Martial Melee Weapon
 * Shield Bonus to AC: +2
 * Max Dexterity Mod: -
 * Armor Check Penalty: -2
 * Arcane Spell Failure Chance: 15%
 * Cost: 40g
 * Weight: 10
 * Hardness: 5
 * HP: 15
 * Damage: 1d4
 * Critical: 20/x2
 * Damage Type: Bludgeoning