Magic level/10 above 10. That means that at 99 Magic there's a one-in-ten chance the effect will activate OSRS Items. However, this can be altered by using pots or seercull effects. The effect of the spell on ananceints is only applicable to the stronger effect. Blood Barrage can only heal barrage and not blast. To illustrate, smoke barrage could lower the opponents' attack by 15% and poisons...