As previously mentioned, in Underrail it's a quest given to you buy a character called Dude, in CoC it's given to you by Antonina.
They are not just similar, they are literally the same quest.
I'll go through the quest as given by dude.
You meet a drunk man in a bar who tells you just how much he loves booze.
Then he gets a vision where he talks about how you go to a nearby warehouse where you find something very important but claims not to know what, specifically.
When you get there, it turns out the place is more dangerous than you were told, it being filled to the brim with mines.
When you get to the item in question, it turns out to be 20 bottles of booze.
When you bring it back he gets another vision and afterwards he mentions how he has had a lot of visions involving you recently.
Then he tells you to that you need a "prepared mind" to explain his vision and gives you 10 of the 20 bottles and tells you to drink and you get totally shitfaced with him.
The descriptions during your drunk sequence are almost word for word the same.
Then when you've drank it all, he tells you his vision shows you going on a journey to get "ingredients", which you can find in his previous homes. When you get to one of his previous homes you find out an ornery old woman now lives there.
After you've circumvented her, you search the house, and find the first ingredient behind a loose wall panel, which Dude realizes is just what you need to enter a "reality rift".
He talks about how booze let's you see this other reality and the ingredient lets you pass through safely.
Does that seem at all familiar?
