Mount Prism

Mount Prism is a holy sanctuary where the divine dragon, Naga resides in Awakening. If the Falchion is brought here with the Fire Emblem, one can perform the Awakening Ceremony, unlocking the true power of the Falchion. However one must be deemed worthy by bathing in Naga's holy flames. Should their inner fire not burn hotter than the flame, that person will die. In Chapter 24, Chrom comes here to complete the Awakening Ceremony and is successful. Naga informs Chrom how to slay the Fell Dragon, Grima