A New Sword

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As Drake grew desperate, his swords shone brightly and suddenly transformed.

This happened not without his consent, or his will at all.

His swords were reacting on their own.

And also, one of his Spirits, Ashlock, the Demonic Yggdrasil Tree Spirit, possessed the Demonic Sword Lucifer which he had stolen and refined from Pandemonium.

All of this happened in just a split second, as Ashlock possessed the sword, he fused with it, transforming it into a pseudo demonic tree.

The sword, Lucifer, leaped towards Celestia, who was shining brightly and becoming gold, Drake's own Combined Armor, formed from the fusion of all his armor-related skills, his own scales, and divinities, merged with her.

And as that happened, Lucifer and Ashlock fused with Celestia, infusing their roots and demonic powers into her.