Adamantine Knights

[...Eh?]

How does the Warforged's Adamantine Body feat work with the Knight's Armor Mastery? Would the speed penalty be ignored, or would it remain, since it's not technically armor? Races of Ebberon lists the movement speed and being treated as wearing heavy armor as separate effects.

[pinkbunny]

As DM, I would rule it so, simply because otherwise the ability becomes useless, and it's not going to break the game.

[marjan]

I agree with ^. By RAW Adamantine Plating isn't heavy armor but it would make sense, since it is pretty much the same.