I have this on my Suneater, though I don't use it often.
Two situations that I use it...
1) I'm tanking a target that is a part of a boss encounter but isn't suppose to die first.
I use burst out all forms of threat in the beginning to make sure the target sticks to me, after that to make things a little easier on healers assigned to me, i switched to jol/sol+suneater with Battlemaster.
2)I'm put in an MT group and suppose to tank an add in a boss encounter.
My add dies and I switch to healing the raid/MT. After going OOM from healing, I run jol or jow / sow with Suneater + Battlemaster.
It should be noted that...I don't have Nightfall yet... you probably go with Nightfall and put other forms of enchants...idk
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