necromancy positive 

Traditions divine

Cast [>>] somatic, verbal

Range touch; Targets up to two weapons, each of which must be wielded by you or a willing ally, or else unattended

Duration 1 minute

You infuse weapons with positive energy. Attacks with these weapons deal an extra 1d4 positive damage to undead.

Heightened (3rd) The damage increases to 2d4 damage.

Heightened (5th) Target up to three weapons, and the damage increases to 3d4 damage.

Core Rulebook, page 331.