Quick Question on War Obsidian Armor

I know it takes Ecto, Shards, and Iron, but I was curious if anyone knows the 4th material in Warrior Obsidian Armor (the set that you can put insignias on).

I was searching Wiki, but it seems to not be listed.

Can anyone help me out here? x_x

http://gw.gamewikis.org/wiki/Warrior_Obsidian_Armor
here ya go, about the middle of the page

http://www.guildwarsguru.com/forum/s...php?t=10092826

As I said, I checked wiki and the one I'm looking for is not listed.

Also, thank you Shadow.