It appears that it does not affect thralls at all.last post in that matter in this thread
EDIT : SUMMERIZE OF THE MOST IMPORTANT POINTS SEEN IN THIS THREAD:
the class / job (archer or fighter) of your thrall has definitely an impact (twice as strong) on the weapon you give him / her
Only sepcial effects like poison are working on your thralls arrows, in short, pretty much every other arrow than the snake arrows are useless on thralls
different tiers of archers / fighters DO matter in the damage output potential of your thralls the higher lvl the more damage they will dish o…