Master Rat - You auto pick the "Very Easy" locks.
Master Rat rank 2 - You auto pick the "Medium" locks
Master Rat rank 3 - You auto pick the "Hard" locks and have a 33% chance to auto pick "Very Hard" locks.
(This means that the moment you begin to pick a very easy lock it instantly unlocks itself, no need to click the "force lock".)
Vampire
You've mutated differently...
You require blood to survive.
Hunger is no longer a problem, you don't hunger.
On the other hand you require a lot of blood and water, the dehydration meter goes down at a ridiculous level when outside in the sun at day.
While at night it goes 20% slower than normally.
Now, getting blood is something you yourself need to figure out. You don't get "fangs".
You can kill someone and initialize "svck blood" from their bodies.
But you can also buy sedatives and chloroform to prevent the victim from waking up.
That way you can still get the blood you require without killing them.
You can also in dialogue force someone to cut themselves and pour their blood into a blood pack or something.
Or you could always buy blood packs from merchants.
The mutation has no visible effects. You don't turn into another color or anything.
And no, this is not like Vance and The Family. Maybe they had the same mutation but it's very unlikely.
The reason for this? Roleplaying!