Kill the Black Knight
Save all of the stat upgrades until Ike becomes a lord and then use them all and level up what's not maxed out also equip Aether a occult scroll to Ike then when you face the black knight go right in front of him and aether should work better I don't know why and it will not always work and use Mist at level 20 with psychic the staff so you don't get Mist killed also ignore the extra soldiers and keep attacking the black knight Aether should happen twice for you to win.
Good luck
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