It occurred to me today that so much  would be explained if Dungeons and Dragons was actually supplying the Potterverse with its stuff. I just picture some Harry Potter wizards accidentally Apparating into a D&D plane and turning it into a gold mine. For example, this is a gelatinous cube:

As you can deduce, it’s a big monster that dissolves things. Swords aren’t much help, but maybe a couple of wizards stumble on it:

“What the hell is that, Nigel?”

“Our meal ticket this month, Rupert. Wands out. And Freezing Charm on three: One… two…”

And a few heavy blows with a hammer later, you’ve got the Acid Pops that they kept selling to the students in Hogsmeade.