DM ing 15 years, Player for 30.
System
The system I run is a hijacked version of 3.5, employing deadly crit tables. I also use hero die to reward player. Experience is rewarded in 2 way first as a group, then the bonus exp is given to a player chosen by the player's.
World
This word has been in the works now for 5 year, It started as table top play for a collage group, That group has shaped the landscape, through play. Today a new group of players are forging on. Putting this world on paper is a new concept for me.
Play
Open world (sandbox), where the groups decisions change the landscape, (You move north, meanwhile a southern town is overrun by Orc's ).