Fanmade boss

Before you complain about his stats being ridiculously high, the idea is he's a boss enemy, similar to Grima in Awakening, against whom you assemble a full army of 10 characters. He starts with 4 allies, and he won't move or attack until they are gone, except teleporting to their side to use Cannibalize, then teleporting back. Obviously, he will become aggressive if attacked.
His sword is the source of his extreme HP, and nullifies the weapon triangle completely, both advantageous and disadvantageous, as well as having built in CD. His support skill can only be used on an ally who is at less than 25% HP. It will reduce their HP to 0, while raising all of his base stats(except HP) by 2, and restoring his HP by the amount of remaining HP his target had. Divine Judgment has a CD of 10. It causes very large AoE damage, equal to 2x his atk, minus the opponents' def or res, whichever is lower.
Origin's Power prevent Effective Against bonuses, as well as increasing his atk and speed by 4 when he attacks(swift sparrow style)
Retribution causes atk/spd/def/res -6 to whomever battles him, regardless of who initiates the attack, and causes a gravity effect on the target and any adjacent ally.
Cruxis Crystal acts as WoM, but with a lower threshold of 25%HP(designed to work with his Cannibalize support skill) and allows him to return to his original spot, as well as increasing his movement range to 3

Made him difficult, but I think he's still beatable if you have powerful units.