Type: General
Source: Planar Handbook
The allies you summon from a specific plane are tougher than normal.
Prerequisite: Cha 13, Spellcraft 5 ranks, Planar Touchstone.
Benefit: When you use a spell or spell-like ability summon a creature native to a plane that has a planar touchstone site to which you have forged a link (see the Planar Touchstone feat), you imbue the creature with exceptional resilience. The creature gains a +4 bonus to its Armor Class and on saving throws for the duration of the summoning effect.
Furthermore, the duration of the summoning effect that brought the creature is doubled. (Effects with a duration of concentration, instantaneous, or permanent are not affected.)
For example, a cleric who has used his Planar Touchstone feat to forge a link between himself and Empyrea Mere touchstone located on the Seven Mounting Heavens Celestia) grants these bonuses to any creature he summons from Celestia, such as a hound archon.
Special: If a creature's indicated environment doesn't specify a particular home plane, but rather a group of related planes (such as "any good-aligned plane"), you may choose to summon a creature of that kind that native to your chosen plane and thus apply the feat's effect normally. However, no component of the alignment of the creature to be summoned may be opposed to any alignment traits of your chosen plane for the feat to work.
For instance, the cleric in the example above could apply the feat's effect to a summoned celestial black bear (lawful good) or a celestial bison (neutral good) since celestial creatures have an environment of "an good-aligned plane." He couldn't apply it to a summon celestial lion (chaotic good), since the lion's alignment has at least one component (chaotic) that is opposed the alignment traits of the Seven Mounting Heavens Celestia (lawful).