I am building a system in which the physics (and metaphysics) are based on a Western Classical Element system: the four basic elements of Fire, Wind, Water and Earth can intermingle with each other forming another para-element based on which one of them was the dominant one.
In this way, for example, you have:
- Fire (dominant) + Earth = Magma
- Earth (dominant)+ Fire = Cinder
- Wind (dominant) + Fire = Smoke
- Wind (dominant) + Water = Fog
- Earth (dominant) + Water = Mud
Those sounds reasonable. I am completely at loss when looking for these combinations, though:
- Fire (dominant) + Wind
- Water (dominant) + Wind
- Water (dominant) + Earth
The classical D&D setting expanded in Planescape uses a similar system, and taking from that, I could get the suggestion that Water + Wind could be Ice, and Water + Earth could be Ooze; however, the former doesn't convince me much, and the latter is not really distinguishable from Mud (it's just more watery mud, basically).
I have tried to find a solution to this looking into various culture element system but couldn't find anything which satisfied me.