Beornings have the shield and the tunic as rewards. It says they give bonus to strength (the tunic), to shield skill and it "bends nature to your will" (the shield). It also says this scales with wildcraft. So I tested it with different wildcraft values. The only skill that works is the bonus to shield skill. The other bonuses don't work. I don't have any additional strength, wolves and warges are still not friendly, the special weather effects - the same situation