Another entry in my Disturbing Magic miniproject:
Floating Disk - it appears nearby and is controlled by casters thought. It's transparent yet slightly discoloured. After sudden impact or exposition to daylight it breaks in hundreds of very fragile shards. Anyone who walks there spreads them with their feet. Feral disks are small and grow very slowly in the dark. They like to create invisible walls and closed spaces in which they slowly build structures used to summon higher terrors.
I can certainly see why. I would like to present them not only as creative tools and unspeakable dangers but also as a dungeon features. Imagine your players know about floating disks and then bump into invisible wall in a dungeon. Strong enough impact or a little bit of daylight may let them get into this secure area but what hides there? Or they encounter invisible platforms allowing to get in unusual place - why would these disk were set like this? Do they lead to a trap or something sinister up there? Or maybe it is clever shortcut of some smart magic user?
