Was brainstorming magic item ideas, and having just finished The Last Airbender, this one tickled my fancy.
Shield of the Avatar
The surface of this shield appears to be an intricate, shifting flow of four different elements.
When you use this shield to redirect an elemental attack, roll+CON. *On a 10+, the attack hits a new target of your choice. On a 7-9, you take half the effect and redirect half. On a miss, your concentration is disrupted and you are unable to control the energy.