Sealed Suit of Armor

This strange, heavy, magical and sealed suit of armor was found in the tunnels beneath the wizard's tower in the Deadwood.

It has some interesting details and what appears to be a sort of panel that can be opened from behind, with a small impression, but so far the party was unable to figure out any effective way to interact with it.

Bob told us that the suit of armor needs an arcane battery. But he didn't explain what that was.