What game is this?

I remember an Xbox game I used to really love playing but cannot remember what it was called this is the best way I can remember to describe it, you design a world  in really great detail you start off by choosing what type of ground you want and you can add rivers, mountains and you can add buildings and characters and when you’ve finished making your world you play through it like a story, you can add goblins as enemies and you have like magic spells and stuff, if anyone can tell me what this game is I’d greatly appreciate it!