Giantkiller only adds an additional 3% dmg to the boss. Is this a bug or is that intentional?
If it’s not, I would suggest an increase. For an affix that can only be used on bosses, I think this is to low, especially compared to other affixes. Iceheart does 5% and charged strikes can be around 6-8%. I think for Giantkiller to live up to its name, it should be closer to 10% since it only works on bosses and nothing else.