No seriously, it has 60% sonic vuln. I rolled last in some hells split and took the seriously nerfed ego as kind of a joke to just throw it in the auction chest to see what even a badly damaged ego item would fetch. Reserve price was 1. It went up to 16 which I thought was kind of appropriate, now its up to 10 mil.
Buyer beware: 60% sonic vuln. Jut wanna be upfront about that so people don't see the ego aug name on it and run in and bid without really looking at the item.