In my mind there is a sword that can never be made in this reality. It has been in my daydreams and my lucid dreams for eons.
It is a Japanese katana sword that is made from a material consisting of the densest matter in all of existence. The hilt is made of an entire swirling galaxy in a miniaturized form. Spinning around the sword without touching like the planets encircle the sun. It has the ability to draw from the infinite source energy that binds everything that is, was, or ever shall be and focus it into the blade. The handle is wrapped in black alligator leather with diamond shaped sapphires, rubies, and emeralds to adorn its dangerous beauty.
It can be used as a energy weapon, or just a sword capable of cutting through any material like a searing hot knife through a stick of butter. The katana also has the ability to allow me to travel through all infinite dimensions, times, and locations throughout the multiverses. Simply by slicing through thin air to create portals to my destinations at will. I can also utilize the innate matter contained within the galaxy itself to transmute anything my imagination can render in an instant.
It is a sword of infinite creation, or absolute certain death. It all depends on my mood and purpose. For it is a tool, nothing more, and nothing less. Allowing me to focus my mind and cut straight to whatever point I am trying to make on my eternal adventures.
When it is sheathed it becomes a simple handcrafted wooden walking staff. That would never look out of place on a hike through the woods, or to help an old wizard walk up a mountainside in middle earth. It is a tool that is seldom needed, or seldom used. For my own powers will always far supersede it.
This is my own words and not AI.
Just a glimpse of my wondrous imagination.
GN