User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-2604:6000:B202:8D00:7987:BAE0:6012:F140-20180326190117/@comment-95.210.189.106-20180330163235

Probabily Issei we not see is form.... But a critical figth with Balberith,will trigger him to unlocking the GR power... Other names are Vali, Crom Cruach, Indra or Shiva(if is really evil) and 666( but I think is necesary AXA for him).