Nabe - Special Ring

If paying for food had been necessary, they would have come up short, but since Ainz was undead and Narberal wore a ring that made eating and drinking unnecessary for her, they were able to save quite a bit of money. The idea behind having one of her two rings be something so boring was to take precaution against poison, but it ended up coming in handy in this unexpected way.

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Volume 2, Chapter 4.1