This quest is acquired from Arrken Feldsen, the arena master in Stone-Bear Hold. You will find him in the north east of the settlement. You will need 2x Silverite and 2x Everite to proceed with the quest. If you don’t already have them in your inventory, you can find them in abundance throughout Frostback Basin. Once you have the materials, speak with Arrken to enter the arena and begin the trials.
During the trials, you will face the following enemies:
Wave 1: 4 Avvar Warriors, 2 Avvar Bowmen
Wave 2: 2 Avvar Warriors, 2 Avvar Bowmen, 2 Avvar Defenders
Wave 3: 2 Avvar Defenders, 2 Avvar Champions, 2 Avvar Bowmen
The first two waves are easily dealt with, just be sure to take out the most aggressive enemies first, such as bowmen and warriors, and then focus on the defenders. The third wave is much more difficult, due to the presence of two Champions. You will find it much easier if you can group them together and then use Mark of the Rift to deal a significant amount of damage at the beginning of the fight. You’ll then want to focus on shielding your allies from their devastating blows, which can kill a light armoured player in one hit, while maintaining sustained damage from afar if possible.