The debuff applied when wielding a two-handed weapon in one hand says the damage procs for the offhand weapon are reduced by half.
When wielding Spectral Blade in the mainhand with a shield it deals 5 arcane damage instead of the usual 10.
The crit proc is also hitting for 15 arcane damage instead of the usual 30.
The problem is not unique to spectral blade. It appears that when using any two-hander with a shield the damage procs are still halved.
[1.3.1] Ogre damage procs for mainhand incorrectly reduced
Moderator: Moderator
Re: [1.3.1] Ogre damage procs for mainhand incorrectly reduc
Already fixed for the next version, I believe.
A little bit of a starters guide written by yours truly here.