Gear
Embellishments:
The highest simming embellishments right now are 2 of the shadowflame-tempered armor patch. Other embellishments to consider are amice of the blue for pure ST and elemental lariat once you have a gem in every slot.
Trinkets:
The best trinkets for destruction are Vessel of Searing Shadow and ominous chromatic essence for pure single target. For mythic+ you want to replace vessel for Irideus Fragment.
Voice of the Silent Star
In 10.1 the final boss of the raid, Scalecommander Sarkareth drops a special cloak, called Voice of the Silent Star. This new cloak is the best simming cloak, just keep in mind that it does not have stamina on it which means that you will be less tanky while wearing it.
Tier Set
2 piece bonus - Channel Demonfire bolts, Immolate, and Incinerate have a chance to fire an additional Demonfire bolt. It is a pretty straight forward bonus. It basically makes it so we need to cast Channel Demonfire on cooldown.
4 piece bonus - Demonfire bolts increase your Fire damage by 1% for 13 sec, stacking up to 8 times. Gaining a stack does not refresh the duration. Casting Channel Demonfiree resets this effect.
Our 4 piece bonus increases our fire damage by 1% per stack, stacking up to 8 times. The only thing to keep in mind is that Channel Demonfire resets your stacks, so you want to press Soul Fire with high stacks. This tier set basically forces us to pick Channel Demonfire so we can utilize the tier set to it’s fullest potential.