RpNation

They're basically RPs that use dice to determine the results of certain actions. If you've heard of Dungeons and Dragons, that's one example of a dice system.

I’d like the do one but I can never find a story line..

If you'd like to join one, there's several in the Dice Interest Check section that are looking. And I believe Grey is generally up for helping explain things, and he does a good job of it.

If you want to run one, it's just like a regular story but with dice.