transmutation 

Traditions arcane, divine, occult

Cast [>>] somatic, verbal

Range touch; Targets 1 weapon that is unattended or wielded by you or a willing ally

Duration 1 minute

The weapon glimmers with magic and energy. The target becomes a +1 striking weapon, gaining a +1 item bonus to attack rolls and increasing the number of weapon damage dice to two.

Core Rulebook, page 349.