I was running some tests today when I came across a stacking issue with the magician donor weapon pet buff (Elemental Power) and Death March IV.
Death March is overwriting Elemental Power instead of stacking like it does with the necro donor weapon pet buff (Augmentation of the Dark Lord). I can work around the problem by adding Death March IV to my pet's blocked spells, but I don't see why it would stack with the necro donor pet buff but not the mage.
Is this intended?