Just an assumption.
We know there was a dark urge character in Baldur's Gate fifteen years ago. Was that the same character as us? We don't know.
Is that dark urge from the game related somehow to us? Again, we don't know. But I think "probably" is a good answer.
For all we know, the Dark Urge is a supernatural entity that flits to a fro looking for victims. Then it jumps into their heads and slowly drives them mad. It could be that this entity picks up a new host every few months or years or whatever.
Or it could be something else entirely.
Shrug. It's all guesswork right now based on the few things we do know.
