"Fissure" is episode 304 of the Berserk manga series.
Short Summary[]
The twice reincarnated Ganishka and a space-tearing stroke from the Skull Knight's Sword of Beherits open a portal to the deepest layers of the Astral World.
Long Summary[]
The Skull Knight manages to slash Femto's back once before he is forced to dodge an attack from Zodd, who retaliates in defense of Femto. Femto then uses his powers to manipulate the spatial tear created by the Skull Knight's Sword of Beherits, removing it from behind his back and holding it like a rope. He reveals that he had anticipated the Skull Knight's appearance, knowing that the knight always arrives at temporal junction points to challenge the God Hand.
Femto places the spatial tear upon Ganishka's face, causing the apostle to split in two. The combined effect of Ganishka's twice reincarnated form and the power of the Sword of Beherits opens a portal to the deepest layers of the Astral World.
The portal widens to such an extent that Ganishka's massive cranium is completely hollowed out. Even the emperor's pseudo-apostle spawn, engaged in battle with the Band of the Falcon below, begin to split open headfirst. Shortly afterward, a massive explosion occurs, and a white light emanates from the astral cavity atop Ganishka's towering form.
All who witness it stare in awe as the light spreads outward from Ganishka, sweeping over everything in its path.