kensai -
every 3 levels gets "-1" to AC (1 lvl +3 = 4; 4lvl + 3 = 7; etc... 10, 13 lvl)
every 3 levels gets "+1" to hit and "+1" to damage (the same)
monk -
every 3 levels +1 attack/round
- 1 to AC every 2 levels
13 levels can kill his enemy by one strike
but we are speaking about kensai
