If you have access to the Blackwood Chapter, you can unlock Mirri Elendis through completing the associated quest in the Blackwood zone.
- The Companion level up progress is account wide, so you only have to level Mirri up once.
- You have to unlock Mirri Elendis on each character through the started quest.
Mirri can be found in the Doomvault Vulpinaz objective in north Blackwood. The quest that you have to complete is called “Shattered and Scattered”.
