The Richest of Savory Meals

The far-ranging travels of Gaunatico and Duir did not except the town of Euspath.
"Euspath is a name familiar to me for an unclear reason. Clarify it," Gaunatico instructed his manservant.
"Euspath's notoriety, sir, is for its virtue, specifically the probity of its citizens."
Nor did their stay put the lie to that reputation. The locals mentioned nothing about bribes, charged prices unable to be construed as exorbitant, and caught up to them bearing the items they pretended to lose with the thought of engineering an excuse. Aside from that, the town had as much of interest as any other. Upon their retirement for the evening Gaunatico proposed to move on the next day, a plan to which Duir had no mind to object. Both slept easily and thoroughly.
They awoke chained to the ground before a pit which blessed them by concealing its depth and contents. The floor was hard, the air close, and worst of all, the place was unfurnished. Behind them, a man spoke.
"Welcome, visitors. I will initiate you into our local custom. First I will employ this dagger which I hold above you, examine it if you like, to cut out your sins. Second I will cast your sins into that pit before you, likely you have surveyed it already, as meals for my creation. Third, you will have left town by then, my creation will emerge and wreak such massacres as will excite the literary imagination for generations. Now then."
The sorcerer yanked back Duir's head and sliced down his chest from which he pulled a dark mass. He did the same to Gaunatico. Both marveled, for neither bled or was harmed at all. The two masses flew above them into the pit, whence soon they heard the terrible sound of a beast's feeding. An awful roar followed that, then silence.
The man walked to the edge and looked down. "It's dead. I didn't expect that. What do you get up to out there? Please don't tell me, since I am no hardier than my poor abomination. I will release you now."
"Don't hurry if it puts you out," Gaunatico told him. "I feel refreshed as I haven't in years. I might stay for a month."
"Please don't," the sorcerer begged.
Finis