Finished the WA I wish we had for our Yogg 0 kill.
If a raid target icon is specified this aura will hide all other nameplates during Shadow Beacon after a 100ms delay so it only runs once and not for every mark event.
A modifier can be specified which, when held during Shadow Beacon, will cancel the nameplate hiding in case the taunting doesn't go to plan, or just so you can watch to see if the other marks got taunted successfully after you've dealt with yours.
This aura can also be used by the group leader or an assistant to handle the marking in a consistent manner, with an additional option to clear the marks used after Shadow Beacon ends (10s later). If you use this feature be sure that you, or another player with permissions, doesn't have a different aura or addon active that is also attempting to do the marking. Also note that the marking player must have the nameplates of the low-health Immortal Guardians on their screen when Shadow Beacon is cast for this option to function.
None of these options are selected by default. See the Custom Options tab.