Defenders of the Faith wrote:
Divine Shield
Prerequisites:Power Attack, Improved Shield Bash, ability to turn or rebuke undead, CHA 13+, STR 13+.
Spend one of your turn/rebuke undead attempts to channel energy into your shield, granting it an enhancement bonus equal to your Charisma modifier. This enhancement bonus applies both to the shield's attacks and defense, and lasts for a number of rounds equal to your Charisma modifier.
Very nice. I think that FrankTrollman's character in the classic Why Monks? thread used Divine Shield, but the character was a mounted lancer paladin.
There was also an obscure bit of errata that let you use Divine Might and Divine Shield as a free action. Well, I say that it was in the errata, but technically it was a clarification since 3.0E had supernatural abilities defaulting to free actions unless otherwise specified. But you know how D&D fans are with appeals to authorities. Couple of sentences from that Skip Williams dipshit are worth more than precedent and evidence.
As a bullshit bonus, here's the 3.5E version.
Complete Warrior wrote:
Divine Shield
Prerequisites: Turn or rebuke undead ability, proficiency with a shield.
As a standard action, spend one of your turn/rebuke undead attempts to channel energy into your shield, granting it a bonus equal to your Charisma modifier. This bonus applies to the shield' bonus to Armor Class and lasts for a number of rounds equal to half of your character level.
Roy used to lead a truthful but counterintuitive and hopelessly misguided crusade to get people to believe that Complete Warrior was the worst thing to happen to warriors in D&D. Stuff like that was his trump card, but it was far from his only one.