
Once you have finished either quest, you will be able to summon your Companion simply by opening the Collections Menu, clicking the Allies option, and setting the desired Companion to Active. Both quests are fairly simple and quick to complete. As for Mirri, you will have to head North and complete a quest called Shattered and Scattered. The quest you will have to complete is Competition and Contracts. To unlock Bastian, you will have to head down to Deepscorn Hollow, on the southwest coast of Blackwood. There is little to no difference in terms of skills between one or the other, so feel free to choose whichever you prefer. Now, there are currently two companions: Bastian and Mirri, and you can unlock them by completing the associated quests, in Blackwood. Before getting into Companion builds for ESO, you need to get yourself a Companion.
