Regarding Death Attack - a major point complicating balance on NWN2 is the lack of a study period. The 3-round duration of study (as distinct from a cooldown) works as a limiter on the spammable save-or-die nature of the attack and lends to a commensurate reward for the risk on the part of the assassin, as there is 1 attack every 4 rounds that will be valid as a save-or-die. Admittedly, having a 3 round period then turns the situation into a hide/spot game, which is also an unsolved discussion. However, I think that if a 3-round study period were implemented, it would be much more reasonable to increase the strength of the ability.
Waiting around studying for 3 rounds = chance to be spotted, true strike long gone used out, to even attempted it again pops them out of stealth
