Opposed Alignments: There are five alignments used in Elements of Magic spells - Chaos, Evil, Good, Law, and Balance. When an Evoke spell or other damaging effect deals alignment-based damage, its effect depends on the alignment of the targets. Some settings may not use alignments for normal characters, and if so, either get rid of alignment damage entirely, or only have it affect outsiders with the appropriate alignment, since outsiders are considered to inherently have that alignment.
Evoke Chaos, Evil, Good, and Law do normal damage to creatures of diametrically opposed alignments, half damage to creatures that are neutral in respect to the appropriate alignment, and no damage to creatures that share the alignment.
Evoke Balance does normal damage to creatures with extreme alignments (LE, CE, LG, and CG), half damage to creatures that are neutral along one axis (NE, NG, LN, and CN), and no damage to true neutral creatures.