You imbue yourself with a powerful mental filter that allows you to manifest an evil power without immediate moral harm (if you are not evil). Evil manifesters gain no benefit from morality of isolation, and this power does not allow you to avoid special power costs—such as ability score damage or other nontraditional costs—of specialized powers.
After you manifest morality of isolation, you have a time window during which you can manifest powers (usually from a power stone) with the evil descriptor without immediate moral consequence (alignment drift or shift), physical damage, or other baneful effects that might result from nonevil manifesters learning and manifesting evil powers. However, for each evil power manifested, you have a 5 percent chance that morality of isolation fails. If morality of isolation fails while a character is manifesting an evil power, he must immediately make a Fortitude save (DC 18) to avoid gaining four negative levels or immediately accept an evil alignment shift (and avoid the negative levels).
You also remain immune to the negative effects of wearing a dreamstained item while the power is in effect.