im still a pretty new 110 on my priest, about 817 ilvl, have not unlocked my 2nd golden node on the artifact tree... did just unlock the 3rd relic slot, but have yet to fill it... i think i messed up somewhere lol
On the plus side, we'll be that much closer to getting our 3rd trait once we get to that point. For what it's worth...
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You should've had an item level 825 relic as a quest reward as you unlocked the 3rd slot, which would be a 36 item level upgrade to your artifact.
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I've seen some people go for a full set of crafted gear with the the "of the Impatient" suffix (double haste, will only display as a single stat) and fully upgrade it to be 7/7 with Obliterum, allowing them to reach haste levels of around 46%.
But yes. This will be extremely expensive. ESPECIALLY for someone as new to the game as you. You'll also be gimping your Crit, for what it's worth, and even though haste is incredible for us, and the more the better, a lot of what I've read says you still want to achieve around 20% crit if possible.