Altus Tunnel is a location on the Altus Plateau in Elden Ring that is home to a pair of Crystalian bosses who can be found there.  Altus Tunnel is located on the Altus Plateau in Elden Ring.  It is located on the Altus Plateau, which is a mountain range in the United States.  There are some materials in this tunnel that are not found anywhere else, such as crafting materials and...