(sorry, pp)

The girl nods at you, and walks back to a door, which must lead to the kitchen.

The young man behind the bar nods emphatically at you. "Aye, my dad had some gnome wizard frind of his make this for him. All it does is cool stuff down, a bit. Like I was telling these two fine folks, we thought that with the upcoming summer months, it'd be nice to offer cold drinks to folks that come in. Saves money on trying to find ice." he chuckles.

Spoiler
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It's a ray with similar properties to the cantrip Ray of Frost, but it really wouldn't have any combat applications, as it doesn't seem to lower the temperature of the target significantly enough to do damage.