User blog comment:Asfidyll/Raikken, Thorns of the Creed/@comment-5663427-20140323080926/@comment-10253076-20140323101812

Hahaha, in this case, Creed means a confession of loyalty. Both Raikken and Avaliel are essentially based on Assassin's Creed, hence the name and the Covens.

If you'd like a secondary explanation, you can refer to my other concept, Avaliel: http://leagueoflegends.wikia.com/wiki/User_blog:Asfidyll/Avaliel,_Call_of_the_Creed