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Excalibur and Rhongomyniad were one and the same.
When Noah's Excalibur shattered against a mighty foe, the fragments were merged with his own planet's Holy Grail, giving birth to the Holy Spear, the Pillar of Light.
However, at the time of his death, all his possession and everything else aside from his own soul, were destroyed.
Excalibur and Rhongomyniad, however, remained as once, connected to his very soul, their Essence as Divine Weapons remained.
When Noah was reincarnated in Abyss as a sickly dhampir, mocked by the children of his village, he manifested this power in the moment of truth, when his village was assaulted by mad necromancers that had come to retrieve more "test subjects".
Through the power of {Manifestation}, Noah's awakened Trait, he was able to summon a weakened version of Excalibur. Alongside many of his older abilities, which he regained one after another.