What it does: It moves up and down the screen, one space for each move you make, and it gets in your way. All the time.
How to make it:
Why would you even want to do that? Well, you can’t.
What it makes:
But you can use a Rock or something to bump two Imps into each other and make a Poison Toad. And that’s preferable to the Imps in every way.
If you have the skills to combine three Night Imps, they turn into a Parent. Take from that what you will.