It's the Mantle of the Winged Eye, seal of the Clan of Balbaroth, and the texture is of the Dunst?n Gate of Nazsgild. I may choose to explain this further sometime, but as of now, there's no need to do so.
The kind fellows living behind this gate are not actually evil - their arcitechture is simply to make them seem more menacing, thus I did not coat it with blood or something of the like.
I spent about a full day trying to make the seal look like it moulded onto the rest of the wall, but in the end I decided it looked too strange when the lighting from the rest of the wall was applied to it. Thus, I tried to make it look like it was flat, yet the back of the seal fit the countour of the spike deals. Not terribly sure if I succeeded, but hey, that's why I ask 
[addsig]