Bard buffing teammate's AC?

[Coinshot Colton]

Are there any good spells/abilities that a vanilla bard can do to buff up a teammate's AC (in full-plate)?

[Gwen Smith]

Aid another is always available. Add Benevolent armor at higher levels.

[ArmouredMonk13]

Blur gives a miss chance which is better than ac because if you critical the air with an earthbreaker it hurts less than if you critical the player. Also might negate instant death.

[Tangaroa]

Haste
Use Magic Device + wands or scrolls of shield of faith or barkskin
Displacement (Miss, not AC)

Crushing Despair and Dirge of Doom effectively do the same thing by giving negatives to hit. You could also pusue Dazzling Display.

[Truesight]

Bodyguard Feat, Helpful trait, Combat reflexes and gloves of arcane striking.

Be adjacent to your big bad fighter, preferably with mirror image up and wielding a longspear. With bodyguard and combat reflexes you can up his AC by 4 for (1+ dex modifier) attacks against him per round, and gloves of arcane striking increase this AC bonus for 1 +1 per 5 caster levels. All without effecting your move or standard actions. The previously mentioned benevolent armor adds to this as well.

[stuart haffenden]

Standing in the way!