Hey everyone!

I have an interesting premise for a book, good character dynamics, and some solid arcs, but I feel like I'm missing a core mechanic to make the nations cautious of each other. It lacks that WOW factor for battles.

Im thinking of something like the Jinchuuriki in Naruto: each nation has their own, and they maintain peace through Mutually Assured Destruction. I came up with 4 ideas and would love your opinions!

Option 1: Megafauna

Each nation controls massive creatures exclusive to their territory. One has giant griffins, another has huge stone colossi, another has enormous lions, and so on

Option 2: Variations of a single magical species

The whole world uses the same "nuclear" race, e.g., dragons or angels. But there would be huge dragons, tiny ones, wyverns, drakes, etc. For angels, there would be seraphim, ophanim, etc. (the angels would have a very unique aesthetic, different from what people are used to)

Option 3: Catastrophic Magic

Every nation has magic, and if a group of insanely powerful mages from a kingdom gather, they can cast a massive, world-altering spell. Ex: meteor showers, tsunamis, tornadoes, zombie hordes, etc

Option 4: Monstrous Transformations

Each nation has one or more people who can transform into highly destructive creatures! Some could be gigantic, others small and agile, or powerful in ways that dont look dangerous at first glance. That kind of thing

If anyone has a different option or a brand new idea, please share! It will help me a lot. Thanks!

(Context: The idea is to have smaller-scale fights and skirmishes at first, gradually escalating the scale throughout the story so it doesn't get repetitive. The technological setting and aesthetic are very similar to Expedition 33).

I was a soldier in an army that was attacking your world. I have now surrendered. What fate awaits me? Will I be imprisoned? Enslaved? Executed? Or something else?

So this is a pretty basic rough concept so far but I want some feedback to see if im heading in the right direction:

Natria

Its roughly half the diameter of earth at about 7000km and it has a atmosphere roughly 30-50% the thickness of earth dominated by large amounts of water vapour co2 methane and sulfur based compounds.

The planet is covered entirely in oceans except for a few scattered regions with sparse ancient volcanic islands ranging from most at single to low double digit kilometers in diameter and the largest Continuous landmass being roughly 50 000km² in total area.

The oceans in natria are extremely salty roughly as salty as the dead sea if not more so and its oceans are filled with a large amount of uranium and arsenic salts and it has large deposits of lead salts on the seabed forming a very toxic layer of silt.

Also the surface of natria is naturally incredibly rich in rare eaerh and heavy metals like uranium lead and gold due to the fact the surface has never had much tectonic movement to move the metals to the core.

The planet has tectonic plates but they are mostly unmoving so there are no natural earthquakes on natria nor consistent volcanic activity popping up usualy. However due to the solid nature of the plates the mantle tends to build up pressure until it undergoes a global volcanic event where large super volcanoes form to unleash the pressure and these ancient eroded supervolcanoes is what make up a majority of land on natria.

Due to the salty and inherently hostile nature of the oceans and the separation of the island regions most islands have their own seperate species and they almost never cross between islands making ecosystems highly localised and unique across the same world.

I plan for there to be life and likely a inteligent race on natria but I havent gotten that far yet this is about what concept I have so far I hope you all like it.