An argument for the North American forums.
The bug: If you craft (Darkness) onto your off-hand and have another different craft of any type on your main-hand, the main-hand's will proc more often than the off-hand and because it procs it forces a shared cooldown with the off-hand, and the off-hand will never proc.
No wonder my off hand never proc! There's like a low chance that it'll proc but doesn't happen often.
ASongsRhythm 2 weeks ago