How much Damage would a Lightsaber do in D and D?

[hamishspence]

I don't care about game balance. I want something that matches the fluff. If the fluff dictates that a lightsabre can do X, then it should be able to do X in game (up to, and including, severe damage to the wielder - which is explicitly and canonically why pretty much only Force-users wielded them).

And Boba Fett, in the EU.

Han uses Luke's to cut open the tauntaun in Episode V.