SO.. as we all know, the Barbarous Thorn Blade is a pretty darn good weapon. BUT it's not as good as the DARK Thorn Blade. Why, you ask?
(Don't dismiss this on the basis of weapon level or number of barbs hitting Vanaduke)
With a max damage bonus......
Level 5 Barbarous Thorn Blade (Vanaduke Poisoned):
http://i.imgur.com/OoCVD.jpg
http://i.imgur.com/onzoH.jpg
Strike: 452, spiky barbs: 107 each, looks like it hit 4 times (a couple may have disappeared)
Level 10 Dark Thorn Blade (Vanaduke poisoned):
http://i.imgur.com/OuNF6.jpg
Strike: 500, spiky barbs: 237 each, hit 6 times
Now, I seriously doubt that levelling the Barbarous Thorn Blade another 5 levels will give a jump in damage of another 130 points.
I will update this thread with more info as I level my Barbarous Thorn Blade back to 10.. However, I remember in the past that I was doing maybe 125-150 per spiky barb when it was level 10.
sk wiki dmg numbers support ur suspicion
http://wiki.spiralknights.com/Dark_Thorn_Blade
http://wiki.spiralknights.com/Barbarous_Thorn_Blade