This is nothing spectacular, but required a little research.
I dug this about 3 down in a tiny park yesterday in my new hometown...Boulder City, Nevada.
It's a pendant associated with a computer role-playing game called Crossfire. Here's what the website (http://crossfire.real-time.com/) says about the game...
Crossfire is an open source, cooperative multiplayer graphical RPG and adventure game. Since its initial release, Crossfire has grown to encompass over 150 monsters, about 3000 maps to explore, an elaborate magic system, 13 races, 15 character classes, a system of skills, and many artifacts and treasures. Crossfire is based in a medieval fantasy world and is similar to other games of this genre.
Please pardon pic quality. I had to use my MacBook...still moving.