Act 43: Usagi and Mamoru's Promise (うさぎと衛の約束　/ Usagi to Mamoru no Yakusoku)

11:52 Brown Youma

Though this series does not usually reuse Youma designs apart from the
cloaked Youma. The brown Youma here appears to be the same sort that 
appeared in Act 33.

11:52 Metalia Youma

This might be also be a good time to point out that as Metalia grows 
stronger, the Metalia Youma changes forms as the episodes progress.