Does the serpent just do one attack, or does it do one attack for each one the SC takes (IE 4 attacks for quickness plus sword of swiftness + another 4 attacks for serpent)? My observations say that its only one, but the text is misleading.
I thought the astral serpent attacked anyone who attacked your unit. So it could potentially have a dozen attacks a round-but then, maybe it doesn't work that way.
__________________
You've sailed off the edge of the map--here there be badgers!
The in game description states that it strikes "each" time the holder attacks so I would take that to be four times for my champs. It is rare for any human sized victim to survive and walk around poisoned, though I have seen it.
I should point out that the slave princes are decked out with 20 strength and a 9 damage blade for 29 and victims are around 21 to 27 hp + arm. So as I understand it if they are surviving attacks it should not be by much. This might mean the few extra points could make a difference or it could just be luck.