Enlightened Iron

The Enlightened Iron is always in the same location and you can go back and get it again each difficulty level for a better version. Or if you are playing Multi-player you can get it as often as you want so that you can dual wield them or check and see if you will get a slightly better version as you level.

The Enlightened Iron can be found between Porto Vallum and Silver Creek at the location below:

As shown above there is a stone platform with a grave on it:

If you click on the grave the following message will pop up:

You can Open the grave and a unique zombie will appear or you can Leave and nothing will happen. So choose to Open the grave and this zombie will appear and attack you:

When it dies the following message will pop up:

The zombie will have dropped its "treasuries", which always include a Stoneskin rune and the Enlightened Iron (there can be more items, usually junk though):