Brelyna's Practice

Walkthrough
After the events of Under Saarthal, Brelyna asks the Dragonborn for a favour. She has been practising spells but needs a test subject to try them out on. Since the Dragonborn is not only sturdy enough, but also more discreet in such matters, a spell is cast.

Wait for Brelyna's spell to wear off
This turns the Dragonborn's vision green, not altogether expected by Brelyna, but she hastens to mention that the spell will wear off, shortly.

The Dragonborn needs to wait about four (in-game) hours for the spell to actually wear off.

Speak to Brelyna
Speaking to Brelyna after the spell has worn off will make it clear that she wants to cast another spell on the Dragonborn. This leads to several very strange transformations, e.g. turning the Dragonborn into a horse briefly. In the end the Dragonborn turns into a human again.

The thankful Brelyna then offers her services as a follower.

Brelynas Übung