*The following macro requires you to have a spare slow weapon that can be used in your offhand (OH)*
As we all know, Fan of Knives (FoK) recently had the cooldown removed, so can be spammed when needed (Energy permitting).
This is especially useful in raids, where most trash is AOE'd down.
Reason to swap weapons:
To increase your potential damage, it's a good idea to swap your Fast Offhand weapon for a Slow weapon, as FoK strikes with both MH and OH. Slow weapon=higher damage range.
[Macro #1]--Swapping to FoK weapons + FoK:
/equipslot 17 Name of Slow OH Weapon
/startattack
/cast Fan of Knives
This will swap in your slow OH, start autoattacking (as weapon swaps stop your autoattacks), and cast FoK.
Tip: be sure to pre-apply a poison to your Slow OH so that it's ready to go when you FoK. I use Wound Poison for the 50% application rate.
[Macro #2]--Switching back to Fast OH:
/equipslot 17 Name of normal OH Weapon
/startattack
Tip: this can be used in combat without interrupting your autoattacks too much during the swap (1 GCD).
Enjoy!