Brothers in Arms: Velen

Brothers in Arms: Velen is the ally quest for Velen in The Witcher 3, and it is all about one person: the sorceress Keira Metz. Whether she fights at Kaer Morhen depends entirely on how her own story ends.

How to start Brothers in Arms: Velen

The quest starts after Va Fail, Elaine, together with The Isle of Mists. It is a level 22 quest, and it fails if not done before you sail to the Isle of Mists.

Keira’s storyline

To get Keira on your side, finish her four side quests:

The decisive moment comes at the end of the last one. Be friendly to Keira and convince her to go to Kaer Morhen. Any other outcome means she will not be there for the battle, and this quest fails. If you finished her storyline earlier, this quest completes automatically.

Tips

Letho can also join the battle through Ghosts of the Past, if he survived The Witcher 2. He is not part of this quest and is not needed for the Full Crew achievement.
See the other ally quests: Novigrad, Skellige and Nilfgaard.

Walkthrough

Talk to Keira Metz.
Complete An Invitation from Keira Metz, A Towerful of Mice and A Favor for a Friend.
In For the Advancement of Learning, be friendly and convince Keira to go to Kaer Morhen.

Quest Consequences & Choices

Keira only joins the battle if you persuade her to go to Kaer Morhen at the end of For the Advancement of Learning. Otherwise this quest fails. It also fails if not completed before The Isle of Mists.