Patch 10.1.5 adds a new upgrade track for Mythic gear that lets you upgrade it to Item Level 447. It will work retroactively for all gear obtained in Season 2.
The new “Myth track” has 3 ranks.
Rank 1: Item Level 441;
Rank 2: Item Level 444;
Rank 3: Item Level 447.
You will be able to retroactively upgrade Season 2 gear obtained before Patch 10.1.5.
Every upgrade requires 1 Aspect’s Shadowflame Crest and Flightstones. Discounts apply as outlined in our gear upgrading guide.
Myth upgrades won’t require an Aspect’s Shadowflame Crest if your character has a higher item-level piece of armor in the same slot.
The Flightstones cost will be halved if a character on your account has a higher item-level gear piece in the same slot.
Aberrus bosses will now drop Rank 1/Rank2/Rank3 Myth gear based on the item level (441/444/447).
Very Rare drops and loot from the final Aberrus bosses on Mythic difficulty still come at a higher item level (450-457).
Here’s an example item from Magmorax. As you can see, the boss drops Myth 3/3 item level 447 gear by default.