I'm going to start a multiplayer game with my friend. He is going to play as a kensai->thief. I had a few quick questions about this guy:

1. His game plan is, after getting UAI, sneaking up behind someone to backstab them with celestial fury, then whip out carsomyr and tank while wearing the leather dragon scales (forget which color they were). Is UAI absolute, allowing literely ANY ITEM? so he can use carsomyr? If he were wearing plate, would it get in the way of his thieving abilities?

2. This guy is specializing in 2-handed weapons, 2-handed swords, katanas(1), and possibly single weapon fighting. Are there any noteworthy 2 handers in SoA to use before he gets UAI, or should he just stick with celestial fury?

3. Finally, I've heard that a good level to dual is 13, but I forget why that is. Should he wait longer, shorter, or level then?

TIA

1) Yes. He can use Carsomyr afet getting UAI.
2) Yes there are. I won't tell you wich tough.
3) Becuase at level 13 you will get an extra ApR IIRC.