For me, one of the most exciting parts of a story (if it isn't a no combat book) is weapons. Especially the weapons that I can consider as most or one of the most powerful ones.
Because of that, I want to learn what my fellow writers created as their ultimate weapons. (If you don't write or have a favorite ultimate weapon from a book published by somebody else, I want to know that as well, please share it!)
And here's the very amateur painting done by me.
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A Magical Crystal based orbital cannon! While I am still very far away on my story to add this bad boy into my mc's arsenal. It is on my road map and marked as must be added to the novel.
This thing is charged by the radioactive rays released from the sun (from the purple two crystals) and fired by mages stationed at the gray parts.
While people can use it for destruction, it is a deposit of magic, and experienced mages can use the stored mana to their will.
For example: Creating barriers for the protection of armies and cities or dumping all of the mana stored inside and causing the magic-sensitive creatures (mages, magical beasts, etc.) to die from mana overdose.
It also serves as a space station and can be used for experiments that can cause massive destruction to the planet.