With these tokens you can buy some useful equipment.
Fist of Guthix is a free and members player versus player activity. Rather than the traditional "first one to kill their opponent wins" style of play, tactics must be used to ensure victory over your opponent. In the game you are paired with another player, and each of you will take a turn at being the hunter and the hunted. These roles need to do opposite things to gain 'charges' and win, then you can get tokens as rewards. You can buy some useful equipment with these tokens.