The target creature gains a +1 bonus to weapon damage for the duration of the spell. Any weapon wielded by the target creature is also considered magic for the purpose of overcoming DR. Divine strike affects the creature regardless of whether he is using ranged or melee weapons, and he may switch out weapons within the spell’s duration and still get the benefits of the spell. The bonus to damage increases by 1 per 3 caster levels to a maximum of +3.

Divine Strike, Mass

School transmutation; Level cleric/oracle 5

Range close (25 ft. +5 ft./2 levels)
Target one creature/level, no two of which can be more than 25 ft. apart

This spell functions as divine strike, except as noted above and that it affects multiple creatures. The bonus to weapon damage increases by 1 per 5 additional caster levels, to a maximum of +3.