If you were to ask the lying guard for ‘an example of a credit card number, expiry date and security code that weren’t the details of the other guard’, they would necessarily have to give the correct details, which the truth guard would pass on

Couldn't they just lie and give you a non-working example?

Or are you hinging your question on a variation of "don't tell me the other guard's credit card information", which you expect the lying card to contradict and tell you?

oh I see, thank you

These are mythical beings no? Surely you would need to be specific, it's kind of their thing.

The babe with the power.

Probably some underpaid employee comes every week to refill the machines

Whether it's coin or cash I guess it will depend on which ATM and which bank you're using

No you can't get instant healing currently since that machine was broken and we are waiting for the IT department to send a technician

Since the adventurers guild is a bunch of communist losers the prices are legally fixed by the government after countless strikes and demonstrations

Every few levels there's an old wizard running a kiosk where you can get stuff cheaper

No reverse vending machine, the government deemed it illegal under monopoly/antitrust laws as whoever gets to control the selling machines can control the entire dungeon economy, but you can some times sell to a wizards kiosk and if you found coins or money you can deposit them at an ATM

The dungeons are still dangerous so nobody wants to live there but I would imagine some small communities or commercial centres and motels in some safe levels

And yes anyone can use a vending machine if they can pay this is capitalism after all

There is a whole show on this with 3 seasons. 🤣

Reborn as a Vending Machine, I Wander Through the Labyrinth

Not the best but least original.

I would be shocked if the carriers hadnt installed an active DAS just to ensure they meet regulatory coverage compliance, but at the very least the dungeon management would want to be implementing an effective wireless solution to ensure dungeon users are happy and staff can have access to operational information. They could also use it for tracking staff and monitoring dungeon utilisation.