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After having changed Jobs, Ervas and Veronica ran back to the tribe of the Harpy, which was not completely affected by the Undead Horde, remaining with most of its buildings intact. Although the Harpy lived mostly inside caves, they had a few dozen buildings outside of them, which were built from bricks and mud, and had strange appearances, resembling birdhouses from Earth.
Each Harpy Building had one to three 'holes' which were the entrances, and no other apparent orifice, nor windows, nor anything, there was a large log beneath each hole within the buildings, which the Harpy would use to enter their nests inside.
Check "The Protagnist's Sister Is Actually the Strongest"!