Weird source of damage

Raazgren
By Raazgren,
So I did a key with this tank druid and noticed he had some totems around him. I checked details damage and saw that it was his top 1 damage spell (Spirit Totem), but I don't think this comes from the druid ability kit or tier set, so I don't know if this guy is exploiting some old level trinket or something like that. Would really like to know.