If you need more damage as a Necromancer, you should be running Coalesced Blood (Image via Blizzard Entertainment) Diablo 4’s Necromancer class features a wealth of amazing passive effects ...
Iron Blood Aspect can only be used by the Barbarian class. In Diablo 4, the strength of affixes are randomly generated within a range of values. This is shown in [parenthesis] in tooltip above.