Of *-slaying Weapon Mod Question

If you add an "Of (whatever)-slaying" mod to a weapon, does the damage bonus apply to all skills used against that race, or just weapon attacks?

If this has been answered elsewhere, my apologies, but could not find it in a few searches.

Weapon modifier bonuses (including stuff like 15^50) only affects the base damage of your weapon. It has no effect on skill bonus damage.

Edited for better clarity.

Ah, unfortunate, but thanks for the reply!

Mods like 20/20 sundering, 15^50 and +20% vs stuff apply to the dmg delt with the weapon only. With shieldmods and staff mods however, with stuff like +1 to Healing atributes (chance 20%) it applys to the skills you cast.

But then again, those mods explicitly state while using skills.