Currency of its will
Long ago, when Lex was concerned about the safety of his Inn, he added something called Delinquent Vines underneath the Inn. They extended throughout the length of the Inn, at that time, and could be remotely controlled to react to any incident happening at any time, anywhere.
Later, the remnant soul of one of Lex's old tenants who had actually died, fused with the Vines, which is how Young McDonald came to be. He had since worked diligently for the Inn, though these days he had less to do with security than managing the underground of the Inn.
Some guests preferred to burrow underground, but then catering to them was not exactly convenient, which is where he came in. Though, as the Inn grew, so did Young McDonald, which is why he was not exactly weak.