A warforged with adamantine plating, from the
Eberron Campaign Setting
4th edition rules
Eberron Player's Guide, pg. 114
Adamantine plating is almost unbreakable metal plating that can be attached to a warforged's external armor. This armor makes the warforged more resistant to damage.
3rd Edition Mechanics Edit
In the 3rd edition, this ability is handled by the feat
Adamantine Body instead of through a warforged components.
4th Edition Mechanics Edit
These attached components act as plate armor. The levels 4 and 9 versions of this armor grants resist 1 to all damage; the levels 14 and 19 versions grant resist 2 to all damage; and the levels 24 and 29 versions grant resist 3 to all damage.
Eberron Player's Guide David Noonan, Ari Marmell, and Robert J. Schwalb (2009). Wizards of the Coast. ISBN 0-7869-5100-1.
Eberron Campaign Setting Keith Baker, Bill Slavicsek, and James Wyatt (2004). Wizards of the Coast. ISBN 0-7869-3274-0.