The sun was completely down by the time he found all four of the cornerstones, as it took a while to dig through piled snow to reach them at each corner.
He had gotten a counter from the System when he found the first one that told him the number—just in case it hadn't been the typical four—and the counter updated when he finished pushing his healing magic into the last inconspicuous rock.
[4/4.]
There was a ding.
[You have successfully cleansed the Hell House and awakened it as a basic tsukumogami. Do you want to change its Owner?]
[Bind it to you: Yes/No?]
Pale eyes widened a moment, a bit confused and also a bit alarmed.
They had been in the malicious innards of a semi-sentient building! How were they unharmed?
Nonetheless, he knew a deal when he saw one and agreed before asking his friend how they managed to walk through a Hell House obliviously.