Blizzard is adding in a way to help players target specific gear in Patch 12.0.5, including a new way for players to obtain Myth track gear.
In their Patch 12.0.5 preview, Blizzard gave us a sneak peek at some of the new activities coming our way, including something called The Voidforge.
Players will first need to help Decimus build the Voidforge. Once completed, players will be able to obtain two new currencies: Nebulous Voidcores and Ascendant Voidcores.
Nebulous Voidcores
Nebulous Voidcores will allow players to target a specific piece of loot from raid bosses, Mythic+, Bountiful Delves, or Preys on Nightmare difficulty. At the end of each activity, players may choose to roll for a random item based on their loot specialization.
Once an item is obtained using a Voidcore, it is removed from the loot pool on that difficulty.
Players can acquire two per week. They’re obtained for gold, 
Veteran Dawncrest, or 
Voidlight Marl. Each roll will cost one Voidcore, except raid bosses which require both Voidcores.
As a bonus, the item level of Mythic+ rewards from the Voidcore will be the same level as the Great Vault rewards. Players who use their Voidcores on Keystones 10+ for example, will obtain Myth 1/6 gear.
Ascendant Voidcores
After finishing a questline with Decimus, players will be able to collect Ascendant Voidcores. These Voidcores can drop from endgame content and will allow players to upgrade weapons and trinkets up to item level 298.
The only requirement is that the item must already be fully upgraded. Maximum-quality crafted weapons and trinkets can also be upgraded.
The Voidforge
As Midnight Season 1 begins, players will assist the domanaar Decimus with the construction of the Voidforge as they explore the nature of mysterious Voidcores. This progression is warband-wide. With the Voidforge’s initial completion in this content update, Decimus gains the ability to transmute Void energy into powerful Nebulous Voidcores every week that can be used to acquire additional loot every week and chase specific items over time. After players help acquire a new tool that will allow Voidforge’s power to reach new heights, Decimus will return the favor by infusing weapons and trinkets with greater power from rare Ascendant Voidcores.
Nebulous Voidcores
Players can use Nebulous Voidcores to more easily obtain specific equipment whether they’re chasing best-in-slot items on their main character or looking to quickly gear up their alts later in the season.
Upon defeating a Midnight Season 1 raid boss or completing a Mythic+ Dungeon, Bountiful Delve, or Prey Hunt on Nightmare difficulty, players may choose to spend their Nebulous Voidcores to receive a random item appropriate for their Loot Specialization from that activity. After receiving an item in this way, it is removed from that loot pool until all eligible items have been obtained on a per-difficulty basis. For example, receiving the Ranger-Captain’s Iridescent Insignia trinket from the Crown of the Cosmos encounter in the Voidspire on Normal difficulty will not remove it from consideration on Heroic or Mythic difficulty. The item level of Mythic+ rewards from Nebulous Voidcores is equivalent to Great Vault rewards from that Keystone level, i.e., Myth 1/6 at Keystone level +10 and above.
Upon completing the Voidspire Crown of the Cosmos encounter on Normal difficulty while carrying Nebulous Voidcores, a Marksmanship Hunter would be offered the following Bonus Loot prompt:
Similarly, upon completing Windrunner Spire on Mythic+ Keystone level +10 or above while carrying Nebulous Voidcores, the same player would see the following:
Some of you may be wondering why some items are missing from these examples. This is because, despite the common misconception, not all loot is Hunter loot.
Decimus will offer Nebulous Voidcores to the player in exchange for a choice of valuable resources including gold, Voidlight Marl, and Veteran Dawncrests. The total number of Nebulous Voidcores available to a character increases by two every week for the remainder of the season. Due to the smaller loot pools and the exceptional power of raid items, these rewards will require two Nebulous Voidcores upon defeating a raid boss. Other endgame content, such as Mythic+, will cost only one. As a result, acquiring a particularly desired trinket, weapon, or ring is likely to require a similar total of Nebulous Voidcores regardless of source. For example, a player chasing a trinket from a raid boss with three total items matching their Loot Specialization is likely to receive that trinket in the same amount of time it would take to acquire a trinket from a Mythic+ dungeon with six total items.
Ascendant Voidcores
Following the Voidforge’s construction, Decimus will ask players to assist him in crafting the Ascendant Nilhammer, a powerful tool capable of manipulating Ascendant Voidcores to empower worthy equipment. Upon completing this warband-wide journey, players may begin acquiring Ascendant Voidcores from Midnight Season 1 endgame content including raids, Mythic+ dungeons, Bountiful Delves, and Nightmare difficulty Prey Hunts. Consuming an Ascendant Voidcore infuses an eligible weapon or trinket with additional power to increase its item level. Only fully upgraded Hero, Myth and maximum quality Radiance Crafted weapons and trinkets are eligible to become Ascendant Voidforged.
