I'm not sure what gear your Necro is using. This is also why EVERY D2 guide tells you to only put the necessary amount of points into strength to equip your gear. Which means the impact per stat point is very small. The enhanced damage by Strength is only added to the base damage of your weapon. The problem here is that you're wrong and telling other players to make Enigma in an Archon plate is simply very bad advice. Especially on Characters which don't use Spirit Monarch. You'll gain very little in terms of defense and you lose a lot in terms of life. The is why it becomes pretty pointless to use an Archon Plate for Enigma. Especially on an Enigma when it has no % enhanced defense. Secondly, Defense is also poorly designed in D2. And I know you say that you don't understand the obsession with Vitality, but it becomes really important on a Hammerdin once you start to increase the number of players. This will leave your Hammerdin with 3k+ life after buffed by BO. So you can put enough point in Dexterity to hit max block and then put the rest into Vitality. The good thing about using a Mage Plate Enigma on Hammerdin is that you don't have to put any points in Strength at all.

This is why you don't want to overcap on Strength. And on a Hammerdin for example it has no impact at all. Strength is supposed to increase your damage but in reality it has very little impact.

The truth is that stats in D2 are pretty poorly designed. So it will give you enough strength to equip the rest of your gear on all characters that don't use Spirit Monarch. But the whole point of making Enigma in a low strength based is that it gives you ~70 strength on a high level character.

Where do i found a enigma diablo 2