Confused about runes Are runes supposed to stack over skill or replace that skill ? Shock Pulse: Release a medium range pulse of 3 unpredictable charges of electricity that deal 105% weapon damage as Lightning. With Fire Bolts: Cast bolts of fire that each deal 136% weapon damage as Fire. ( replace? ) With Explosive Bolts: Slain enemies explode, dealing 70% weapon damage as Lightning to every enemy within 10 yards. ( stack? ) Its a bit confusing.