Assassins morale and other buffs

[the benevolent adversary]

actually I believe neither of those morale artifacts will work on anything but human, and though it seems the assassins are human I do not think it will work on them. but hey try it out I could be wrong.
personally I would rather use the royal snakes then the assassins, they can be buffed if you want (I also usually get the blue pet dragon which gives them a higher initiative).
if you are getting lots of criticals then the jolly roger sword is sweet (adds 20% damage to critical hits).