Spells enhanced / impended in the abyss?

[Napfelsaft]

Hey guys , in "The Midnight Isles" is written that in the Abyss :

-Spells and spell-like abilities with the chaotic or evil descriptor are enhanced
-Spells and spell-like abilities with the lawful or good descriptor are impeded

What does this exactly mean?

[Jeff Morse]

try here, it should help.
http://paizo.com/pathfinderRPG/prd/gameMasteryGuide/planarAdventures.html

[Napfelsaft]

Great ! Thanks, brother !