King Atillart Sword, You need;
4 Majestic Horns
5 Diablos Thoracic
5 Black Blos Thoracic
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when you have repeled the lagiacrus and you are on the five star quests you can forge a bone long sword.
First you need the kikumonji sword.
Complete the Cold Call event quest. Which is to hunt the Great Baggi , Gigginox and Barioth. When you have about 5/6 dark metal and 3 amber tusks. you can get the tenebra long sword.
King Atillart Sword
Slash it with your sword. You can block its attack with your shield.