User blog comment:B214/Volume 22 spoilers/@comment-201.190.18.199-20160720050108/@comment-24.113.252.213-20160720054902

After Vali decreased Fenrir's size and power, his fangs could still kill Gods. I think Fenrir is one of the top 4 in the Vali Team (Vali, Arthur, Bikou, and Fenrir [in no particular order]).