necromancy positive 

Traditions divine, primal

Cast [>] to [>>>] (somatic, verbal)

Range touch; Targets 1 to 3 non-magical stones or sling bullets

Duration 1 minute

You pour positive energy into ordinary stones, granting them temporary magical properties. You can target 1 non-magical stone or sling bullet for every action you use Casting this Spell.

The stones must be unattended or carried by you or a willing ally. The stones become +1 striking disrupting sling bullets. Each stone can be used only once, after which it crumbles to dust.

Advanced Player’s Guide, page 222.