I was messing around in an infinite basement run with achievements off, and I was using the console. I decided to look for commands from the Bertran mod, and I found the "berk" command. Every time I use it, though, it says "That's not a berk". Even when I try the names of actual berks like "narcissism", it says it isn't a berk.
How does the Berk command work and how do I use it?