Type of Feat: Class
Prerequisite: Sword Leader level 1.
Specifics: You may aid an ally, giving them a bonus to their armour class for one round in exchange for an AC penalty of your own.
The height of the bonus AC is 1 + Shield Size, for a total +4 AC when using a Tower Shield.
The height of the AC penalty is Shield Size -1, for a total -2 AC when using a Tower Shield.
If you are a shielding a small creature, the penalty is reduced by 1. Similarly, if you are a small creature yourself the penalty is reduced by 1. This can't reduce the penalty below 0. Thus, a Halfling with a Large Shield can bestow +3 AC at no penalty, regardless of whether they shield a Human or a Gnome.