Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Valkyrie Profile: Covenant of the Plume is the third installment in the Valkyrie Profile series of role-playing games. It was developed by tri-Ace and published by Square Enix for the Nintendo DS, released on November 1, 2008 in Japan; on March 17, 2009 in North America; and in all PAL regions on April 3, 2009.Valkyrie Profile: Covenant of the Plume''s gameplay is presented mainly from an isometric view. The player''s two-dimensional character sprites move about on a three-dimensional map akin to those of a tactical role-playing game. Characters can attack enemies individually or can actively support each other via the Mutual Assist system.