I don't remember the mobs name, but I got the shield off him the other night. He was a 5-dot lvl 21 Troll walking in the river by Lakeview on Thestra.
The shield stats were silly cool. The AC was 100 and there are some stats on it. I will get the exact stats on it as soon as I can.
**EDIT -
Gorzags Toenail is the name of the shield.