So last week I created a few common and uncommon wondrous items, so of course I have to make some rare and very rare ones this time around. We all know those are the items that players crave, even if they can only attune to three of them at a time. Even if they aren't powerful weapons or armor of great protection, they provide some great opportunities for the players to do some things they may not otherwise have the chance to.
Bottle of the Trapped Undead - Who wouldn't want a container filled with all sorts of undead creatures to do your bidding. What could possibly go wrong?
Expanding Airship - Sure, folding boats are nice, but how often do you actually need to use one? Unless your trapped in a dungeon, this provides you with a way to get from point A to point B in a jiffy. The sky's the limit!
Swarm of Caltrops - This is one of my favorites so far. A DM can describe these little guys as scampering around the ground as if they have tiny little legs.