I've had fanfic ideas for a sword based on the elements--not the Periodic Table elements, though.
Elements as in Water, Fire, Earth and Air. I never found the time to write about it yet, but from my brainstorming of ideas, I kind of took the concept from a role-playing game, called
Rune Factory--a spin-off of
Harvest Moon... In that game, you can forge your own weapons--not what I'm getting at, but there is this sword called the "Forth Element" that requires you to forge four swords together--each based on one of the four elements: Razer (fire), Grantale (earth), Snow Crown (water), Star Saber (air). I took that concept and modified it.
Well, anyways, I'd say there'd be, like, four major dungeons--a few minor ones, but in these major element-based temples/palaces, you'd obtain an elemental sword to keep. You can equip them, but once you get all four, they fuse together to form the primary sword of the game... if that makes any sense... Taking this directly from my brainstorming for the dropped fanfic, this is what I stated:
Elemental Shade, the final sword of the story; forged by combining the following:
- Burning Sword (fire)
- Terraspaeda (earth)
- Cyclone Stirrer (wind/air)
- Hydraslice (water)
A little corny, but... yeah.