Replying...
Intro. You were once a war veteran and fight bravely for your country but you ended up dying how many explosive.You are reborn in this new fantasy world all kinds of new possibilities. There dragon, Monsters, demons, and of course magic and other things that you expect to find in a fantasy world. But you're given a special ability. You can control a black cloud or dust (depends on how you interpreted) that has the ability to devour organic and none organic substance down to the microscope level and repurpose it. Meaning if you want you can tear apart in monster and create your own one but it will be like a drone then a living thing something that will solely follow your command, as more like a tool then I live in creature. And you can create bioforms think of the tyrants from Warhammer 40k, you know those where the alien Xenomorph like monsters yes your power is like that but in a much smaller scale and we can mix of the arigami from God eaten. Use this power as you wish

The new world and all its glory

@Lulk