You can use an action to place this 1-inch rubber ball on the ground and speak its command word. The ball rapidly grows into a balloon fortress that remains until you use an action to speak the command word that dismisses it, which works only if the fortress is empty.
The fortress is a square tower, 20 feet on a side and 30 feet high, with arrow slits on all sides and a battlement atop it. Its interior is divided into two floors, with a rubber ladder running along one wall to connect them. The ladder ends at a trapdoor leading to the roof. Inside the fortress, rubber ball fill in the first floor make it difficult terrain. When activated, the tower has a small door on the side facing you. The door opens only at your command, which you can speak as a bonus action. Once closed the door cannot be opened without your permission. It is immune to the knock spell and similar magic, such as that of a chime of opening.
It has features as instant fortress. But instead of conjuring a adamantine fortress, It appear to be a rubber balloon. When activated, it gently push every creature away to an unoccupied space outside but next to the fortress without taking damage. Objects in the area that aren't being worn or carried are pushed automatically.
Due to flexibility and durability, It bounce any projectile back make it immune to damage from any projectile, force and bludgeoning damage. The enchantment make it resists to magical damage. But because it is just rubber balloon house, it vulnerable to slash and piercing damage from melee attack. The roof, the door, and the walls each have 120 hit points. If the HP reach 0, that part deflated. If four wall of the fortress was destroyed, This magic item lost its magic.
You can spend your bonus action to speak the command word that dismisses it, which works only if the inside of the fortress is empty. The creatures stay on the top of the fortress slowly lower down while the fortress deflate. The fortress turn back to rubber ball in front of its user.
Once you used, it can't be used again until [roll]1d4[/roll] days have passed. Next time you use this item, the Fortress restore itself to its full condition.
The wish spell can be used to completely restore entire fortress and reactivate the magic to the destroyed fortress. The fortress can be used instantly after restored by this way.
Notes: Utility, Warding
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