You'll notice that I removed several of the thief skills. This was on purpose as I've always felt the Assassin was too similar to the thief. But as you can see I fleshed out poison and allowed the Assassin start with a decent chance to use his skills right at level 1. (I'm a big fan of d6 for thief skills) Otherwise there is very little difference here compared to the S&W version.If an assassin gains surprise (see combat) he may elect to assassinate the victim instead of backstab. The assassin need not roll to hit for an assassination attempt, which is a special attack resulting in a chance to kill the victim instantly and ensure damage even if the victim is not successfully killed. Instead the assassinate will roll percentile dice chance based on the assassin's level and the victim's level as shown in the table above. If the assassination attempt does not succeed then regular damage is inflicted. The assassin does not gain backstab multiple damage on a failed assassination attempt, even if the assassination attempt was made from behind.
Ambusher is the main new skill that's added. If I was going to add in the Assassination Table I would remove the Ambusher skill. So there ya go. Pick it apart.