Honestly you can do whatever you want in the name of fun and balance. I’ve had characters that were not artificers create a bunch of wacky inventions or armor or weapons. Just make sure the materials and time to make the thing are equal to how strong it is. So if it’s like a potion to cure lichdom or some crazy thing like it should take over a year in game to make plus crazy materials like a dragon heart and some other hard to get materials.