The 21st chapter of the Shakugan no Shana X: Eternal Song manga series.

Nachtigall activated the metal plate pivotal to Asiz's Grand Scheme, the creation of the Heir to Both Worlds.


Nachtigall's voice rang out towards the metal plate, causing the characters carved on it to light up. Asiz was in awe that she could activate the extremely complex Unrestricted Spell Insignias, which he had no clue how to even decipher, with one cry. As Asiz used his flames to break open the coffin with the girl inside, he ordered Nachtigall to use the Unrestricted Spells of "Disintegration" and "Fixation" to weave a thread which would interweave the existences of himself and the girl so that they could be together in this world. Looking at the girl, Asiz thought of her as she had been while alive. The spell would "disintegrate" the girl, an existence of this world, and Asiz, an existence of the Crimson Realm. With their existences interwoven and as one, the spell would "fixate" their combined existence to this world, giving birth to their child, the Heir to Both Worlds.

Mathilde and Wilhelmina were underneath rubble and sensed that Asiz had started his plan. Mathilde broke through the rubble with Knights battering rams. Outside, Wilhelmina could see the fatigue on Mathilde's face. From the fog at the foot of Brocken Fortress emerged Illuyanka, and on his head, Merihim. Wilhelmina then saw Mathilde's expression twist into delight from seeing her foes. Merihim asked Mathilde if she was ready for battle, and she manifested a halberd and quipped back.


Powers and Abilities UsedEdit

Unrestricted SpellsEdit

Treasure ToolsEdit



  • Asiz (to Nachtigall): "By operating these Unrestricted Spells, the "Disintegration" and "Fixation" of existences, you will spin "the thread that will let us be together in this world" which will interweave me. ...The girl... "Disintegrate" her, an existence of this world. "Disintegrate" me, an existence of the Crimson Realm. "Fixate" our existences, which I will interweave to join and become one, in this world. Give birth to our child—— the "Heir to Both Worlds"."
  • Merihim: "I take it preparations are in order?"
    Mathilde: "You're asking me?"


Shakugan no Shana X: Eternal Song
Volume I Chapter 01Chapter 02Chapter 03Chapter 04Chapter 05
Volume II Chapter 06Chapter 07Chapter 08Chapter 09Chapter 10Chapter 11Chapter 12Chapter 13Chapter 14Promotional Manga
Volume III Chapter 15Chapter 16Chapter 17Chapter 18Chapter 19Chapter 20Chapter 21Chapter 22Chapter 23Chapter 24
Volume IV Chapter 25Chapter 26Chapter 27Chapter 28Chapter 29Chapter 30Chapter 31
Volume V Chapter 32Chapter 33Chapter 34Chapter 35Final Chapter
Other Shii Kiya's Afterword
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