Yes, it would add up to damage reduction over the course of a fight. But how much? I am sick and tired of being told no, you cannot have that because mages are the premier pet class. This is why there is now a canyon between mage pets and necro pets in tankability. Mages not only have the best HP and AC in game, but they get summoned armor, weapons, masks. They have more pet AAs to make them DPS and tank better. Mages even have more spells to maximize their pets potential. You telling me that a lifetap weapon is going to put necro pets ahead of mage pets? Give me a break. If you are not willing to do the parsing like I have, then you don't have any ground to stand on.