The first thing you have to do is go to the in the southern region of Grantebridgescire, northwest of the city of Walden, in order to find the mini boss.
You can choose to walk away or fight him, if you walk away in addition to not being able to complete the mission, it will also allow you to get the reward for completing it.
When starting the fight, you will have to take good cover, because the mini boss will try to hit you when the cutscene is over.
Dodge his punch from him and drain his attacks to stun him, and use this moment to do a stun attack to wipe out his health bar. When you are done with it, you will receive a key to a locked door as a reward.
Now that you know how to beat the Walloper in Assassin's Creed Valhalla you are ready to complete this mission and defeat this enemy in record time, so good luck.
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