Kvasir told you that you would need to undergo a test of your combat skills before joining Fenris Fangs. You need to visit Njord, Sichel and Skadi and collect Pandaemonium Decorations to provide your skills. You obtained Pandaemonium Decorations and brought them to Skadi. He gave you a Mark of Contribution in return, which you presented to High Priest Balder to perform the purification ritual. Afterwards, Balder sent you to Kvasir, who congratulated you and gave you Pauldrons.