S1·E8 Phantom, The Undead Knight!

Phantom, the ‘no.1 Knight’ zombie from the resurrection assembles all Chess Pieces warriors in the hall of a levitating castle and loses no time raising his men's esprit de corps with the long-awaited declaration of the 2nd Marchen war. At the same time, Ginta's gang meets with Dorothy; and Alan sends all four of them into the training dimension of "Training Gate" (Shuuren no mon) for a quick fighting coaching, knowing time's running out.