Below is a walkthrough for the Thanks to a Comrade I subquest in Valkyrie Elysium.
Obtained: Speak with Eygon in Valhalla after completing Chapter 3: An Unexpected Encounter
Objective: Explore Be’elze
Head to the northeastern part of Be’elze and interact with the portal there.
You’ll then be teleported to a different area where you’ll need to fight off waves of enemies. After you defeat them all, the subquest will complete!
Rewards:
- Meteor Swarm I
- Voltage Chain
- Impulse