Renfred

Notes:

 * Spams an enhanced version of Utsusemi: Ni for a couple of seconds to produce 4 clones of himself.
 * Clones are quite weak defensively; AoE damage works well.
 * Clones resist all sleep spells.
 * Ninjutsu is spammed, causing bad spell lock when changing targets.
 * Eventually (after 3~5 minutes)he becomes targetable and must be defeated to win the battle.
 * Easiest way to tell which one is real: he takes less damage and maintains his HP, while all the clones respawn with 100% HP.
 * Even after becoming targetable, he continues to spawn clones of himself. Pay attention to which enemy is using Utsusemi to know which is the enemy that needs to be defeated.
 * After defeating the real version, any clones still out will shortly depop.