Recently I've been trying to make my dream characters into tangible concepts which is why I've asked so many different class-related questions. I was skimming through templates and found the soulfire creature template in the ability quested below it says that it deals "half as pure good-aligned energy" so that made me wonder can good-aligned energy hurt good-aligned creatures?
Soulfire Substitution (Su) A soulfire creature can modify any spell, magic item, or effect with an energy descriptor to use soulfire instead as a free action. The effect’s descriptor changes to good and fire-for example, a cone of cold composed of soulfire energy is an evocation [fire, good] spell. Such effects deal half their damage as fire damage, and half as pure good-aligned magic energy.
Not sure if they are related but there is a cleric spell called align weapon (see below) but that only seems to be for making a weapon bypass dr and doesn't actually make it deal "good-aligned damage" or the like.
School transmutation [see text]; Level cleric/oracle 2, inquisitor 2; Domain chaos 2, evil 2, good 2, law 2; Subdomain demodand (chaos, evil) 2
Casting Time 1 standard action Components V, S, DF
Range touch Target weapon touched or 50 projectiles (all of which must be together at the time of casting) Duration 1 min./level Saving Throw Will negates (harmless, object); Spell Resistance yes (harmless, object)
Align weapon makes a weapon chaotic, evil, good, or lawful, as you choose. A weapon that is aligned can bypass the damage reduction of certain creatures. This spell has no effect on a weapon that already has an alignment.
You can’t cast this spell on a natural weapon, such as an unarmed strike. When you make a weapon chaotic, evil, good, or lawful, align weapon is a chaotic, evil, good, or lawful spell, respectively.