I've tried 5 times to enchant ASPD stone for my Rudra wing and it's all failed.
09/07/18 try enchanting twice and it's failed
10/07/18 try another 2 and it's failed
then I decided to change to my alt account and it's also failed with the last aspd stone I had.
is there any bug issue with this NPC?
is it really a 50% success rate?