(There's a link to the CSV file with all of that generators magical effects on that website. I strongly recommend downloading that and scrolling through it) Some of my own ideas: Water Averse: Contact with water, can even just be a light drizzle negatively impacts the functionality of this item. It might extinguish something like a Flame Tongue, a Lightning weapon might electrocute its user etc. Scared of Heights: Good for flying items. Did this one for a Broom of Flying once. It essentially imposed a height limit and attempting to force it above that height limit off the ground made the sentient item either wrestle with you or disable its abilities entirely. Works in Reverse: I did this with Boots of Running before, but basically they only enhanced your speed while running backwards.