It shouldn't. The damage from the focus shield will vary with the swing speed of the mobs attacking it, and not spells hitting them. If Wild Power works on focus shield that is a bug as far as I know.
Okay. Does MoArcane (+buff %) affect damage shield/focus damage shield? I ask for a solo Summon SM PvE farmer. I know it will affect the S/C and D/Q buffs, is there any RA that increases the Damage Shield, or should I kust test it myself?