There seem very few devices or items that aid magic, this categories lists those mentioned.
“This page is a candidate for deletion. Remember to check what links here and the page history...Magic Objects
“A Demon trap is a magic device resembling a landmine. They are created by the sacrifice of a...Demon trap
“A Mary Engine is a device of unknown function. It appears to be have been manufactured in...Mary Engine
“Magical landmine, developed by the Vikings to protect their longhouses from supernatural threats...Magic items