As I mentioned previously, fantasy worlds where magic weapons are rare in the extreme needn't be devoid of those supernatural horrors that can only be harmed by magic weapons, but adventurers will stand a better chance of surviving if they have some sort of alternative at their disposal. One alternative is the spell, of which the second level magic-user spell ensorcel weapon is one example (q.v.). The fourth level clerical spell sanctify weapon, described below, is another.
This spell conforms to the wisdom of Basic/Expert D&D and Labyrinth Lord in that creatures who are only affected by magic weapons are affected by any magic weapon regardless of its bonus.
Spell Class: Cleric
Spell Level: 4
This spell invests one ordinary weapon with a divine purpose: that of destroying supernatural forces of an alignment other than the caster’s. Specifically, it renders the weapon effective against those beings who are invulnerable to non-magical (or non-silver) weapons. The spell lasts as long as it is being used against such beings. If the weapon is ever used to strike any foe other than supernatural enemies, the weapon will become desanctified and the spell’s effect will end. This spell does not confer combat bonuses.
Lawful clerics may employ this spell against demons, devils, the undead, and hostile elementals. Chaotic clerics may employ it against angels and hostile elementals.
If the ninefold alignment system is being used, alignment opposition will be determined by Good vs. Evil, not Law vs. Chaos.