I have an idea for a semi-modern rp with alchemy reminiscent of Fullmetal Alchemist, but without requiring the use of alchemy circles. It also goes beyond the mere transmutation of metals and such, but actually draws on the 4 elements, light and dark, and nature. The general plot is that black chunks of metal fall from the sky, impacting the world with a sinister aura that is expelled upon hitting.

Monsters begin spawning, and people stay away from these "Zero" regions, areas most densely populated by monsters surrounding the "Stardust" chunks. Stardust is a powerful, black metal, but can only be worked through alchemy. Each transmutation of it makes it more difficult to work, but makes it stronger. A grade system will be applied to determine the strength of the pieces of metal. Some escapes, because weaker monsters sometimes carry it on them, or shards get launched in it's grade 1 form impacting the world.