Einherjar (神剣エクセリオン,Shinken Ekuserion?), also known as Ecthelion is a weapon that appears in Riviera: The Promised Land. It is Ein's Diviner, from which he also derives his name. Einherjar is a sword-type weapon. During the Angelic Advent chapter, Ein is able to learn and perform the Lv 1 Overskill Double Slash with it, but it is later replaced with his Execution-level Disaresta.
Einherjar is unique in that it is modified throughout the game, often between the stages, though this can go unnoticed to many players. Only its rightful owner, Ein, uses this weapon well; the heroines will only throw the item if used, and Ledah simply has nothing to do with it.