Stacking weapon damage modifiers.

Grim Dawn General Discussion
1

Is this true?

Bladeburst activates weapon damage mod (% Harbinger of Souls +Vitality decay)
default attack activates weapon damage mod (Harbinger of Souls +Vitality decay)

These [(+%Vitality decay) + (Vitality decay)], stack.

Right?

2

Damage-over-time applied by your weapon from two different % weapon based sources do not stack - the highest is used.