Прозрачный [Perspicuus]
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Not all Orcish units join the castle with the player, except for the Paoka. Also, you can reach this Orcish army from the boat directly on the surface to the third castle in this location (by the way, these Orcish units are located in the same place).
P.S. Someone already mentioned the hole, so it's okay.
Damn it... I tried to fix the hole issue, and I thought I had fixed it.
But... it seems not. Okay, I'll go into the editor and set a Mask there.