Spec Specific Azerite Traits
The First Dance is the absolute best trait to go for, you need 1 on your gear as it increases your haste and grants you 2 extra combo points.
Loyal to the End is a fairly decent new trait that gives mastery, increasing with the more people that have it in your raid. I tend to prefer this trait over something else if they are of similar value, solely because if a person dies, its value increases by quite a lot.
Azerite traits rotation changes
When playing with The First Dance, always make sure you go into your Shadow Dance without any combo points. The extra 2 from the trait plus the combo points generated by your first Shadowstrike will suffice to send you to 5+ combo points, depending on procs.
Recommended Azerite Traits
Sub is a spec that has mostly standalone traits, meaning that they drop in value by quite a bit when stacked. Making them most efficiency when you only have 1 of them.
New Essences in Patch 8.3
Breath Of The Dying is a new essence that will be gated behind Uldum Accord reputation. This looks like our go-to minor essence, with an extra bonus during execute range.
Spark of Inspiration increases the damage of people in your party, within 15 yards, by 45% on a 1 minute cooldown (when used on a major slot) and is more of a supportive essence. The minor effect gives you and up to 2 of your allies (on rank 3) a proc of haste and cooldown reduction on your main essence.
Formless Void allows you to copy the essence of your target, with passive corruption reduction. Its minor boosts your main stat every time an ally uses an essence.
Condensed Life-Force should be your go to major essence unless you are killing the boss in less or around 3 minutes, in which case you should be using BotE. In terms of usage, you don’t need to think too much of it, you should use it before Symbols on your opener, and then on cooldown during the fight.
Blood of the Enemy is great for both ST and cleave and especially in shorter fights. I tend to use this Essence quite often on fights where I’m not certain if my CLF will get 2 full uses, and always on Zaqul/Azshara.
Memory of the Lucid Dream is your best minor that you almost always want to be using regardless of boss.
Conflict and Strife is great overall.
Purification Protocol is excellent for cleave and especially Za’qul with the adds being aberrations.
Corruption on gear has a chance to proc a positive effect, with 3 tiers of potency. The higher the tier, the more corruption on the item.
There are several positive effects on gear, some prominent ones right now are: Infinite Star, Echoing Void and Twilight Devastation.
Infinite Stars is a random proc from any ability that strikes a random target, debuffing it with a stack of Infinite Stars. This will increase damage taken by 25% from your Infinite Stars proc, stacking up to 10 times.
Echoing Void stacks up each time you deal damage, with a chance to collapse each time you gain a stack, dealing shadow damage to all nearby enemies.
Twilight Devastation is a beam in a cone facing in-front of you and is mostly good for AoE.