In 2.3, I don't think a Sanc aura tank spec will be as practical anymore, because you will have to pick up the extra 10% stamina which is dumped at the bottom of the tree.
To get holy shield you need minimum 30 points in prot. Point 31 is HS, 32/33 are Imp HS 34/35/36/37/38 are AD, 39/40/41/42/43 is WE.
The only way to cut this down to 40 points is to either drop Imp HS, which is a big no, or drop 3 points in AD, which makes it pretty pointless having 2/5, and is a big talent to miss out anyway, especially with bigger health pools coming in (22k max hp = 7.7k is the AD cutoff point). You can easily make a sanc aura spec but I think now it would gimp you too much, which is a shame because a lot of people use it to great effect.
As of here and now, pick either, different styles really. Frizbee = utility, sanc aura = 10% extra threat (10% extra dmg is 10% extra threat, but that doesn't count white damage so probably say 9.5% extra threat)
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